I've done a lot of searching but cant find the Falskaar faction ID. I mainly need this to remove a bounty from Falskaar of 40, but every time I try to talk to a guard they just instantly try to kill me. I've used a calming spell on the guards and talk to them but they just don't want to arrest me after using the spell.

Only thing I found so far is that the jarl is a member of the Borvaldurs faction. Not sure if the guards belong to that or not, but it's a place to start.

Also you might have better luck asking on the mod's page at the Nexus.

Or, better yet, the Skyrim Mods forum here.

I found it after some guessing with the help command. The Falskaar Crime Faction is 0615999D. maybe this will help some other people with this problem.