aye... but if you're of a good alignment... then why would you have a bounty?
On the PVP level you may want to introduce the alignment system. You know "Good, Neutral, Evil" system. Depending on your alignment, townbots and guards and even bad guys may respond differently to you. Of course... then the whole method of attcking by bots would need to be changed to somethign other than just a team change. ie; if you're evil and a bot is evil but will sell to you when you're near it, then it shouldn't be on the enemy team attacking the good aligned people... it would need a scripted method of choosing targets and dealing out damage based on the alignment system.
The team system may even be delt away with entirely if the alignment system is done properly... the only probelm I see with the alignment system is accidental killings and possibly a LOT of coding to make the bots un-retarded. ;-)
Of course, you could have them choose their targets based on their distance from you as well as your alignment points. (make a -999 to -150 evil, -149 to +149 neutral and a +150 to +999 good) Of course, the system would only have leeway for Player Characters; good can attack good, evil could attack evil... there's not a team boundary.
That brings us to the next step; teams based on player party's. When a player forms a party, that becomes a team. When the player invites people and they join, they also join that team (as the engine sees it) and would therefore not deal damage to one an other on accidental misses.
The team-party may even be named after the party leader and when you or someone else joins that party-team it would say globally "Ozzy has joined Particle's party" or "Ozzy has joined team Particle."
....Also, to make the evil neutral good system a bit more spicy;
-999 to -250 -Evil (ie; purely evil dialogue options)
-249 to -150 -Evil (with a small chance of good ie; some good menu options still)
-149 to +149 -Neutral (ie; all menu options)
+150 to +249 -Good (with a small chance of evil ie; some evil menu options still)
+250 to +999 -Good (ie; all purely good menu options)
Why have the scale go up to 999 so far past the marker? Well, if you're an Evil PK, this will make it harder for you to make your character good through anything short of a whole avalanche of divine goodness. If you're good it will make it that much tougher for you to find an evil quest in a town bot to do, or kill neutral/goos players/bots to become evil.
There's more thought on this range area... but I have work to do... so adios for now!
Anyhow... I've thought about this a lot, but I have just not had the time to post much about it. If ther're questions on the system... I could expand my meanings more, and I understand the team-party system may not work.