Within the forum I have created 3 boards requested by some of my long time members with seperate moderators for each board. The mods have most moderator rights except banning. Is it possible to give those moderators banning rights to ban members from that board only and not the entire forum?
Unfortunately, no. You can't "ban" someone from a board without banning them from the entire forum except by denying them access to that board, and this in turn would require a permission to let moderators manage the board(s) they moderate, which doesn't exist.