PMSS:Allowing user to change rTorrent settings
This is actually a really easy task, all you need to do is change the permissions of the file.
To do it for single user:
cd /home/USERNAME chown USERNAME.USERNAME .rtorrent.rc
To give this ability to all users being created, edit /scripts/addUser.php and remove from bottom the chown root.root .rtorrent.rc line or comment it out, remember to redo it after updates. Remember that this file is overwritten on a update, so you should consider using a PMSS Module