Future request

Problem1: multiple times I notice "awaiting payment" for my rigs, and ending up into "Payment not received - rental cancelled". Losing 10 minutes of mining time. For rentals of 3 hours each time, this is a lot of lost renting time. Also, and i`m not sure about this, there is no penalty for users that do not pay. I could jam the system by clicking on multiple rigs to rent it, but not paying it.

Possible solution
Make a wallet dedicated to your site for each registered user. That way users can have bitcoins under their account and rent a rig on-the-fly. Both renter and hire person would benefit of this.

Problem2: It should be great if it was possible to make a queue for rigs that will become available the next 10minutes. Maybe even to give the current renter the possibility to extend the mining time.