Undo Permission Change
It would be great to have an undo permission settings in SP. Currently users can quickly rectify the mistakes of accidental deletion of content. However there is nothing that helps to rectify any changes made to the permission model i.e. accidentally re inherit permissions from parent, severing all unique changes made.
Matt Groves commented
This feature should also allow another (suitably privileged) user to roll-back a change made by someone else...
Also I have noticed that policy inheritance in online sharepoint is not working as it is expected. Policy applied to child is automatically applied to its grand child and parent.
There must be an option to revert of fix.