Yeah re-organising events/groups isn't quite there yet, for instance you can't drag a group/event to the bottom of a list within a group without it becoming a subevent, so you have to drag it to the 2nd last event then move the last event above the 2nd last.
Inserting could be more efficient too. I made a topic about it but it was ignored so I'll state it here again:
<img src="https://dl.dropbox.com/u/1024727/c2/inserting.PNG" border="0" />
When using this awesome right click menu in the event sheet (by clicking to the side of the sheet), if you insert an event/group it will put it at the bottom of the sheet instead of placing it closest to the mouse position ? which would improve efficiency significantly, since its the best right click menu.