None of the developers nor of the active open-source contributors intends to add support for other networks.

And, the vast majority of users do not have adequate bandwidth to cope with their chosen Upload, Download and Queue Slots...
On ONE network.

Adding other 'networks' is a very counterproductive step for practically all users.

limewire rocks. its better then everything out there. Its very fast and most of the files on the network are legit. What network can compete? Kazaa? Give me a break. speed? once about a time ago, but now its beyond slow. Dependability? Oh hell no. fasttrack is littered with garbage, so much garbage that it forced me to move to another network.

multiple network support
 

Shareaza claims to support multiple networks, however in its most recent guise connection to gnutella has been less than satisfactory. In my experience at best I have been connected to only one G1 ultrapeer at a time for only short periods making the network unusable. Gnutella 2 may have the technological edge but just doesn't have the volume of content, edonkey is great if you have dsl/cable but for those of us with dial-up modems the queues are just to long. Having been away from Limewire for some time I'm glad to be back downloading lots of those luurvley gnutella files.