Ooohh, I'm for both. I will probably mostly play blood spleef, as I never manage to get above level 5 before blowing it on another enchant, but would also play the non-leathal version.
I especially like Duck's locale and roads as they would lead right past my castle construction.
As an aside, Stuman has already built the top left section of road pretty close to where you proposed. You should tie into that if you can.