What about a
RetroShareAza, which combined Shareaza with Retroshare.
So it is a Retro Share Aza
Retroshare Instant Messenger (retroshare.sf.net) is an serverless p2p Instant Messenger Buddylist, which is as well in c++ and could be added to the Shareaza Gui in a new Tab (hooking up the friendslist) or in menue bar with all menues.
So, what about the RSA?