Admin-side : Reordering categories

Hello all,

I’ve tried to found out a solution for this, but with no chance by the moment : it is possible to change the order the categories are displayed … in the posts editor ?

I’m interested in showing several of them before any others – just for usability reasons and ease of selection, but all the plugins I found are front-end oriented.

I tried to write them as follows (which isn’t really the best solution):

A- Music
B- Video Games
C- Films
and all the rest here, with no 'introduction letter'

, but in the blog they appear litterally like that, and I’d like to avoid it.
Ideally, the cats would be created normally, but being shown in a specific order via some kind of hack.

Any help is greatly appreciated, thanks