I think it will be terrific for this purpose. Though I guess it mainly applies to games with many frames. But working with multiple frames has always been so painful that I converted my game to single-frame format years ago.
So I basically have one engine frame for runtime, and one* level editor frame. I was hoping to be able to use this feature to cut down on the pasting I need to do between those 2 frames, but that's probably not going to work out.
*I actually have loads of clones of the level editor level - one per level, but this feature is irrelevant to them since they need objects at edit time, so I'll always need to manually paste new objects into them anyway.
So maybe not to useful for me, definitely a good feature!