Copy and paste screenshots from clipboard into RTF fields and attach them to the list item.
It would be great if you could copy a picture/screenshot into clipboard and paste it into a RTF filed in Sharepoint. the file could be attached automatically to the item instead uploading it to a library.
I agree with Anonymous with respect to a third party tool being required. It is great ideas like these that make it hard to convince others in the enterprise not to use Jira or other tools.
In my eyes It is shameful for Microsoft that this functionality requires the use of third party tools (i.e. http://www.kwizcom.com/sharepoint-apps/paste-plus/overview/)
By the way, a similar request has been pending for almost 3 years: https://sharepoint.uservoice.com/forums/329214-sites-and-collaboration/suggestions/9002491-drag-and-drop-images-in-wiki-pages-and-blogs