As title says! I know it is a small thing, but this would definitely be something other MMO's do not bring come expansions and such. Being able to change the login screen to older screens. For me I loved all the login screens, but to be able to choose the backround ( hey even one of our own screen shots) to music sound files that are available or even more premade backround (think Undercity concept art WITH the song sylvannas sings!)
I know it is something small but hey more customization and maybe even add things in game to smaller achievements to unlock cool stuff for this little feature!
Give any thought on this =D
Please no flaming or off topic complaints. =D If I can compile a list of awesome ideas to add to this I will compile an awesome suggestion thread to blizzard and hey give it a go the correct way =)