Some good, some bad.
I used to play CS:S quite a bit, so I feel the pain in some of them
Part 1: I always find knife fights to be silly, to be honest, so if someone asks for one, I just refuse, not kill them while we agreed to one.
Part 2: I know this one so well with the scout, as I honestly feel like a cheapass using the other two (I nearly killed an enitire team with an AWP once), but the scout can be annoyingly in-accurate at the worst moments.
Part 3: I used to play in a 24/7 office server quite a bit, and one kid frequented it. Unfortunatly, is voice had defenitly not cracked, and since all talk is on (everyone can hear everyone else), we ALL have to put up with it. Team flashing was never a major problem, if it was, it was purely accidental, or someone was being a douche at the match start-up.