You learn UnrealScript mainly by reading other people's code. Removing code without an important reason (download size reduction and lack of helpfulness are not important in that sense) is extremely antisocial IMHO.
You can do it on an individual player. I've never used it - so no idea if it works.
I haven't used this yet, but thanks for the info.@Romulus. I tried to reply to you, but pm's ain't going through