Drag and drop on group window

[gm9]

I assume this is about changing the position at which group members appear on the group window (because I can't imagine anything else you would want to drag'n'drop)? While it's theoretically possible to mod some way to rearrange it on the fly (notwithstanding some hardcoding of the order by SOE), I somewhat fail to see the point and in any case don't think the effort to code this well would be worth it. But I don't think it's impossible.