[flup]

There are usergroup permissions in the script allready, but that will only determine wether a user is able to use the uploader or not. Perhaps you are thinking of:

Admins: max. 10 per time
Mod: max. 5 per time
User: max. 2 per time

or something? If you only mean the access to the file per usergroup, use this at top of the script:

// set allowed usergroups - separate with a comma
define('UGS','6,7,2,5,9');

I added a functionality to set the place where the watermark will go.