Originally posted by Flashblade
So I followed your manual put the line about charactermenu in ingame.txt and put the edited version into assets1.pk3.
I thought you might try that, but I wanted to warn you, first, that doing this has altered your assets1.pk3 file and you will no longer be able to play on "pure" multiplayer servers. It will know your copy of assets1.pk3 and the server's are different and will not allow you to connect to the server (if it's pure). This is done to prevent cheating.
Perhaps, instead, you should make a *new* pk3 file with *just* the new ingame.txt in it (and restore your retail version of the assets1.pk3). Name it anything that comes alphabetically after "assets1" (so that it will override the ingame.txt in assets1).