NCM Username associted with a Network(tacacs+) Username.

I have NCM setup to do real-time configuration change detection using a user ID and password (tacacs+) for it to log into when downloading and comparing configs after they are changed.  This works wonderfully.  However, it uses this same username and password when we make a 'config change template' change when we would prefer it to use a username and password associated with the user who is implementing the change.  Is there a way to set this up?

Thanks!