+1 for the chat but -1 for the doors - they are opening because the T are getting too close so the noice is because of them.
About the crowbar i think it can be removed because i dont see the point of it...
Crowbar has increased dmg hit for stab. However most t's don't know that and just use it to annoy people.
Clearly doors, the doors make the noise but they don't have minds and brains to make the noise willingly, since a player is triggering them to open we kill the player

Some maps have removed the door noise problem. Chat is the part of being silent, some ct's don't want to read and consider it as talking(we can modify and say that if the chat consists of caps lock letter,aka shouting can be considered killing). Chat is a way of communication but ct's think that the type of communication is vocal and kill them. (No difference between communication type is the main problem)