End user control of refresh / snapshot revert

Is there any way to allow a end user the ability to revert a snap shot?

I have a group of testers that need the ability to log on to a VM, install software and reboot before beginning test, but when when done need to have the VM reverted to a clean state.

I can't find a way to allow this.

..

Setting the pool to non-persistent will cause the VM to refresh on restart / log off, but they need the ability reboot without causing the refresh.