[Powerlord]

Three solutions I can think of:

1. Add an override to the group for these users for the sm_votemap command (i.e. "sm_votemap" "allow")
2. Override the votemap command to use the "a" permission, then remove the k and g permissions from them.
3. Remove the g permission and see if votemap works with just the k permission (I've never been clear on if it requires either permission or both).

Personally, I'd recommend #1.