[rsbac] Default Role for New Created Users

[Ahmed Alzhrani]

I would like for all new users that will be created later with (a specific Linux group or maybe a range of UIDs) to be assigned a default RC role.
Currently, a default role is General User for all users, but I would like to change that with my own custom role. Is this possible?Or do you think ACL is the way to go? 
A brief explanation would be great!
Thank you,Alzhrani