I have found two tutorials of how to write a script that counts how many Actors have been killed by a specific weapon (thus making the weapon stronger and stronger). Is there also a way to write a kill count script that works without using a specific weapon?
Just use getPCMiscStat 5 and getPCMiscStat 6 to check creatures and people killed. This only works for the PC though. If you want to do it for all actors you could use an event handler.