Copy the contents of your unrealtournament.ini on top of your unreal.ini. Then, remove unneccessary sections again, but leave things like engine, sound, core, in. You might have to play a bit around to see what you can take out again. UED2 still crashes when you exit, but that's not a prob.
Oh, and make a backup of your new unreal.ini. On some crashes, the ini file gets overwritten again; just replace it with your backup.