1-I agree with picking up grenades since you only have 3 and I use them pretty fast .(But, I think Wrath already changed that so now you can pick up the nades from the dead players.)
2-I mean if the losing team had 2 awpers and they are losing I don't think giving more awps to the losing team will make them win, and most of the people are playing with ak or m4.
3-Well if the first player of the wining team is carrying the game for his team even if you change him to the losing team he will still carry and win the rounds for the losing team, and sometimes players just want to play on one team they might leave if they get automatically changed from the team that they wanted to play on.
4-Russian walking will do nothing to the game, people using silent walking aren't a big problem it only a litle bit harder to kill them, but that what makes the game fun.