(I'm working on all this, so be patient)
sure. the menu just got me confused, cause I couldn't figure out anything it was doing. But the edit group menu item is really cool already. Though, I don't think that single clicking an object that is not in the group should go back to root editing, because when you edit a group you might accidently click an object, that you didn't want to and - zooooomm- you're not editing the group anymore. maybe a doubleclick outside the group could leave the group again. On the other and I'm not sure I want to be able to leave a "layer" at all, after all, since there is no such thing as "root" once you call the groups layers. everything is in a group right from the beginning, since a canvas without a layer has to be a blank canvas.
So basically, with the introduction of layers it's about time to convert the old xml editor to a object treeview.
But I'm patient :)
David