Membership plugin – restrict group creation?

I would like to restrict group creation to a certain membership level. How could I achieve this?

I’ve looked at the supporter plug-in but I need a free membership lvl and a paid for one so the membership plug-in seems to be the best option.

Also my currency isn’t listed, ( ‘R’ South Africa ) would this be a case of paypal not supporting the currency yet?

Edit: If I restricted the uri group/create, could that work like protecting media?

nvm the url restriction isn’t secure.