And besides the questionable efforts to sabotage perfectly legal software and limit the users bandwith without paying money back, there is a technical reason that makes any attempt to do so pointless.
Whatever you do to obfuscate the protocol, you have to make sure your p2p partner understands your request or you could simply shut down amule. As long as other systems can contact yours (and since _all_ clients have to be compatible you can't do major changes anyway), your provider can create filters.
Cheers,
boot