@mux:

I don't know if this has been suggested yet (you seem to be open to suggestions):

- Make queuing possible. For example User #1 rents Betarig, User #2 gets in line for Betarig and starts mining when User #1 is finished.
- Implement rating underneath the rig names sort of like on youtube you see like/dislike distribution before clicking the link or a more advanced version would be time/popularity/rent duration algorithm, such one is used here (http://www.giantpygmy.net/gpa/index.php?id=dada-autorating) for foobar2000 songs autorating. It scores songs based on duration, replay amount and last time played.