On the subject of never banning anyone, there are problems with that. Eventually you are going to run into people who are going to think anything is a valid tactic, like shockedfrog here, except he apparently either hasn't thought REALLY BIG yet or still has some morals. For example:
Your mine could be forcefielded by an enemy.
Your crucibles could be forcefielded by an enemy.
Any of your other important buildings, stockpiles, anything else public... Why steal what you can forcefield, if you're a griefer?
Your hearth fires could be forcefielded by someone who WON'T agree to remove the forcefield. (until that bug gets fixed, anyways)
Your few remaining apple trees, if any, could be forcefielded... Are you getting the picture?
I'm not sure what mechanic there could be to prevent these things from being used against large villages, besides pre-emptive forcefielding of your own property (which is not acceptable for communal villages). Village-list-based forcefielding would work, though.
shockedfrog wrote:I try to avoid bloodshed, though I think if it comes to it I could probably pick off a few of you here and there, one way or another. This brings back more flashbacks of RPG World Online, where it was possible to burn people by giving them lit campfires.

At one point I built and lit a campfire in a wheat field in Brodgar, first to see if I could build one in a wheat field, and second to see if the wheat would catch on fire, which, alas, it did not (Although I didn't really expect it would). It would've been a spectacular sight if it had, though.