This mod will allow admins to assign members to a position titled 'Override' that will override their group permissions on designated boards.

Author: Dandello

Instructions:

Apply the mod and upload (in ASCII mode):

cgi-bin/yabb2/Admin/Modlist.pm
cgi-bin/yabb2/Admin/ManageBoards.pm
cgi-bin/yabb2/Admin/MemberGroups.pm
cgi-bin/yabb2/Languages/English/Admin.lng
cgi-bin/yabb2/Sources/Load.pm
cgi-bin/yabb2/Sources/Profile.pm
cgi-bin/yabb2/Sources/Security.pm
cgi-bin/yabb2/Variables/Settings.pm

In the Admin Center -> ManageBoards -> Forum Controls -> Boards -> Check the Override box.
In Member Profile -> Admin Edit -> assign the member to the 'override' position. This is a non-visible position and will not affect the appearance of their membership on other groups EXCEPT that they cannot be also be a Global or Forum Moderator.