Project Management Module - remove names from available users list

Project Management Module - remove names from available users list

Folks, not all of our staff are approved to work on projects. How do I remove them from the 'available users list'?  If that feature isn't available today, when will it be? 
The available users list can be quite long with everyone in it especially when they don't need to be.  Happy to go through and disable users that have no need of this module.

thanks
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