This was originally Berz's idea from a conversation we had last night on Skype, but he has apparently decided to be a shitlord and not post it.
The AP cost IS TOO DAMN HIGH! for the current rate at which we acquire it. This is a time in which we cannot allow any amount of AP to go to waste.
Actions such as talking, placing graffiti, opening doors and flipping breakers should not cost AP. Maybe even reloading your weapons should be free.
Free talking might lead to channel flood, yes, but might there be a way to limit how many messages one can send in a minute? It's not like having even just 3 people talking at once doesn't flood the channel as it is. Or how about this idea: Make walkie-talkie's rechargeable items that come with 10 charges and you regain 1 charge every 5 minutes. Essentially Talking AP.
Graffiti should not cost AP because you have to spend AP to find the cans to begin with, and then they run out at random. Those in place act as perfect guards against graffiti spam already.
Breakers don't seem like a large enough action to warrant AP use. Hypothetically you could get into an endless breaker war with another person continuously switching them on you, but this is a game in which you can literally kill that person and throw them out for doing so. Simply make it tell who is flipping the breakers and this is a non-issue.
Doors are the same as above.
There are a few other minor actions that should also not cost AP but these were the main ones that came to mind.