Using the hole on the top of undergrounds first objective can be nice, you can stand on the same side you want your nades to go and bounce them off the rim, Its a nice spot because it allows you to be protected and cover the top tube too.
Id need to get a picture of it, but theres a specific location you can stand on the right side of attackers spawn on the mid point of trainyard where you can volly nades and they bounce of the edge of the door and land inside killing anyone trying to defuse.
it tells you what perks each level has. Commander specifically, gets a signature.
if your timer for ranked only gets to about 5 mins before a game starts, consider yourself lucky
As far as i believe they are working on a UI overhaul again, I think they spoke about it on one of the ask the devs videos from about a month back