Scoreboard and Map Information:
I seriously think that this is a non-issue, and don't support change.
The enhanced map (added with the latest release of TUT I believe) is very useful for both guards and thieves to coordinate their actions.
I agree with keeping the notification if a guard is killed. Killing should not be stealthy.
I wouldn't mind lowering the sound caused by KO'ing, which atm can draw alot of AI from the surrounding area. This fits in well with the recently implemented changes to the blackjack arc, and the proposed changes to loadouts (see loadout thread) that would require it to be purchased.