Undo button.

[meshedvr]

Undo won't be possible until 2.X, and even then might be very limited. It isn't possible to record every physics object (1000s) every frame, and VaM is largely physics driven. So undo might be able to undo a move of a node you did interactively, but if that move caused the model to get tangled, the undo likely won't fix it.

 

[MacGruber]

Maybe the option to have an autosave while in EditMode every 30sec, keeping the last 10 versions or something? Normal scene save is usually fast enough for that if there is a way to skip the thumbnail screenshot. Actually I would assume it should be possible to build a plugin for this already.

 

[meshedvr]

2.X will have auto-save as well, and it will be done mostly on a background thread where Unity would permit (many Unity components cannot be accessed on a thread). Save is not a fast operation, especially if the scene has animation, although I'm working to split animation to its own separate binary store file.