Just a thought, but it would be nice to know when someone rents, how about sending an email out to the rig owner with the info that your rig has been rented and who rented it, so the rig owners can hop onto the admin page and make sure it's mining for the client.
I've run into a couple times where something weird happened and it didn't save the client's information. I usually catch it pretty quick because I'm always monitoring the site, but just to make that process a little faster.