Feature request: Undo and select-all option for regions

[jdelhaize2]

For my workflow, I have many times wished there was an 'undo' option for a region, like when I accidentally move or reshape it while unlocked. Also, would be very helpful to be able to select several or all regions at the same time. eg. to delete many at the same time.

[Leyya04]

These addition would be very useful to me as well!