Not critical at all but a "nice-to-have" feature would be the ability to re-group the components that were last un-grouped.
A few times now I've run into fairly complex screens where I needed to ungroup a set of components just so I can modify one component, then go back through the tedious process of selecting all the same components and grouping them again.
It'd be nice if it simply remembered which set of components were in the last 'ungroup' and then just group those back together (sans any components that were deleted of course)