door blocking only works in groups really, but its sorta like catching fish you just need enough people to cover the exits at a spawn point.... there are only a select few good spots tho (ill take some pictures maybe after work)

 

you can tho on modes like hq and domination block common routes slowing your team down (ie stairs), but dying usually comes quick so dont plan on having tea

 

mic spam, unfortunately many servers dont use mics, but theres plenty that do, i have no idea if there is an hlss for that... i dont use voice annoys

 

blairingly shooting your mg in sniper positions, they really hate that especially when you are persistant (only works on certain maps also)

 

kicking the crap outta the other team be it either legit or hacks and calling in airstrikes that kill lots of people along with the heli right afterwards

 

blatent wall hacking due to bullet penetration

 

using a gay name or a racist name if you can get away with it

 

picking on individuals on your team by running around knifing them (always stick to one person as best as possible)

 

thats the few i got off my head right now feel free to add more

- Spamming chat (if possible)

 

- Calling everyone you kill a faggot or nigger

 

- Teamflashing everyone on your team

 

- Teamkilling

 

- Giving away everyones position to the other team