Creating a new usermanager

We want to store some users in a different location to the default /home/users

We also want to use the user manager to achieve this. How do we create a new user manager that has a different location for users eg /home/newlocation/users for example? Finally can we then use this new user manager when implementing the social features of cq 5.6. E.g can we tell the comments system to look for users using our new user manager? 

We would also want to keep the default user manager.