Xthreads and Group Permissions

[Verilog]

First of all thank you very much for creating Xthreads
Basically i am trying to use Xthreads depending upon group permissions
Normally if a user is a reviewer usergroup than only he can post a thread with custom thread field else he will post a normal thread
Is it possible somehow ?
Also what will happen if a particular forum which does not have custom thread fields and a moderator tries to move a thread with custom thread field to that forum ?