In my area the scooter rental businesses ask for 5000 baht deposit and a copy of your passport with no demand for a motorcycle license .
We have a guest house and have thought to rent motorcycles to our guests . But after much thought I think it is a risky business if you own property that would invite being sued for all you have got in the event of a accident by one of the renters . If you have nothing then you are safe like most of the scooter rental companies in Thailand .