There already is stacked movement with which you can't issue grouped order but at least grouped movement (this includes the re-basing of aircraft as well!).
There also is an "upgrade all" command: Shift-U
There is not exactly a "wake all" command but you can right cilck on a stack and shift click all the units you want to wake up. Unfortunately only the ones in the stack.
So I have to say that I personally don't need group movement as for the most common types there already is a possibility.
Some kind of "Stacked Bombardment" (Arty or bomber) would be great though!
But of course I wouldn't object if they put a goup button in the game in a future patch.