When creating Site Collections through CSOM and providing an LCID. (For example 2067) an exception is thrown.

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SiteCreationProperties.Template\r\nParameter name: Specified value is not supported for the SiteCreationProperties.Template parameter." is thrown at ExecuteQuery();
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The Exception is also not pointing in the right direction.
1) It should be possible to create Site Collections providing the LCID
2) When an Invalid Lcid is passed, the exception should point in the right direction.

PowerShell or CSOM Import/Export and Backup/Restore Site Collections in SharePoint Online

The only way to expand SharePoint events from a calendar is using CAML. There should be a way to retrieve the recurring events fully expanded using REST.

At the moment it does not seem possible to create WebPart connections via the Client Side Object Model.

The latest version of the SharePoint Framework Yeoman generator contains a mix of features that are GA and preview features (for example connecting to MS Graph, web part connections, extensions). Whether the generated solution can be run in production depends on the features used to build the web part. With that, when bundling the project, the toolchain should warn of any experimental features being used in the project which would prevent the solution from being deployed to production tenants. This would help developers avoid deploying solutions depending on experimental features to production tenants, only to see the deployment fail.

Right now there is no API to check that. If you add a security group into a SharePoint group, there is no way to check if the current user is a part of the SharePoint group: The user is not listed in the group.Users and the SharePoint group is not listed in the user.Groups. The 3 APIs that allowed to do this in full trust code are missing from CSOM so we need an alternative.

The recommended list option is ONLY 5000, the structure has been indicated to hold up to 30 Million items. but I had a list over the 5000 and experienced issue with IE and MS will not resolve. We cant be the only company that would like lists with over 5000 items. The idea would be a special list page - the list page could handle over 5000 item, but the requirement is the information be hosted as an external list.

List items that have an Audience field attached should be audience filtered when retrieved via the REST API.

For example, a list that has link items with the Audience field attached to target particular items at particular groups of people. If the REST APIs are used to retrieve items from this list, then the identity of the requesting user should be optionally used to filter the results based on audience.

It would be great to have Visual Studio integrated tools that simplify SharePoint development taking into account latest Microsoft recommendations in this area: avoid to use Features Framework and use the Remote Provisioning pattern when doing common task such as provision site collection and sites, extend existing site collections and sites, apply custom branding and so on

I have not been able to find an equivalent function in CSOM to automate content type publishing like the way we can do it with server OM ContentTypePublisher class. Please add this feature to CSOM.

I've created an UserProfile with some custom properties.
When using http://siteurl/_api/SP.UserProfiles.PeopleManager/GetMyProperties, I get a resultset with all UserProfile properties, including my custom properties.

When I try to select one (or more) of my custom properties by http://siteurl/_api/SP.UserProfiles.PeopleManager/GetMyProperties?$select=CustomProperty, I do not get the custom property returned.

Selecting on the default properties that SharePoint provides does work.

Right now I am using a workaround which iterates through the (big) resultset with all properties to get my custom property values, but it would be great if I could select just my customer properties.

Today we get PageHead & PageFooter... would like to have BEFORE/AFTER DIV's for `QuickLaunch` & `PlaceholderMain`

Cross-reference:
https://github.com/SharePoint/sp-dev-docs/issues/625

I need to create a List/Library using a custom template.

This was supported in Server OM, but you can't do it programmatically in SPOnline. If you try to do using SP UI, it works as expected. So, If it is supported by the UI, it should be supported by the API.

Thanks.

Sys.CultureInfo.CurrentCulture holds date / number format information for the language your site is using.

It is useful for displaying and parsing dates and numbers while accepting input in the native locale of the current user.

If you visit new/edit item form and refresh the page - Sys.CultureInfo.CurrentCulture will show the wrong culture until you visit any other page in your site.

Please fix this bug so that we can rely on this object and continue to use it and support other languages and cultures.

Currently if you implement site provisioning solution and you need to install some third party known app, you should activate side loading feature that is not recommended for production(by security reasons) and use method load and install.
this way has several disadvantages:
1) Customers will afraid such solution because of recommendations outlined above.
2) Upgrade process. it will "painfully" to upgrade each package on each site
3) You need an app package file to get file stream for LoadAndInstall method

Possibly by allowing the user to enter an app name upon granting permissions.

This will allow users to grant read/write permissions against two or more lists on a site.

This means, when designing apps they would be able to function more like OOB lists or libraries; with either extended functionality or be deployed in conjunction with a Client App Part to provide client functionality.

An Example of this might be a "Rotating Image Gallery" app. Allowing multiple of these to be deployed to the same web is ideal, with independent permissions and content.