Add Ability to Limit Node Types

Hi, great module! Not sure if this is possible, but I would be interested in the ability to limit nodetype changes. For example, I'd like to have a configuration option that allows me to specify which content types Nodetype can be applied to. Then only those node types would appear in the Content Type dropdown box that you see in the node edit form. Might be willing to pay for this to be added depending on the cost?

Thanks.