Add disk space quota mannualy

Hello,

My site is configured in a MU Wordpress installation.

I have the upgrades and supporter plugin installed.

I create a test package (Addon) that allow members to increase the disk quota up to 100 MG.

When a user buy this package with credits how can i increase manually the disk quota for this member? It's possible to do that?

It's possible to have in the system members with different disk space quotas without being supporter members?

Thank you

Vítor