Control of Reseller services

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I thought it would be good if you could control the services that your resellers can sell along with there quotas. What I mean is that I have a rule that we don't want any of our users hosting CGI and so I instruct all the resellers to never sell CGI to a user. I would prefer to be able to turn off the resellers ability to sell CGI thus negating the problem. Is there a way to do this at current??