Reputation System, usergroup restrictions

[jim doodle]

Hi there,

Our forum has a very busy trade section where trade members can have a paid subscription to advertise their services.

We currently have a no naming & shaming policy, but we want to have a system where people can judge the reputation of the traders which is where the reputation comes in to action.

however i don't want every usergroup to have visible reputation just a specific usergroup.

I can see the following setting:

Can See Who Left User Ratings:
Can Use Reputation:
Can Hide Reputation from Others:
Can Leave Negative Reputation:

However i don't see how i can set "hide reputation from others" on by default for specific usergroups?

Am i missing something?