Manually and permanently upgrade to Supporter


I know we can manually upgrade a site to Supporter via Super Admin > Supporter > Extends ... but the max period is 365 days. Is it possible to set a site permanently to Supporter instead of 365 days?

Also, can I manually set a Supporter user to have ie. 3 Supporter's sites? For example, maybe 3 credits for the user to upgrade his/her 3 sites to Supporter.

Thank you in advance.

Regards, William