Alternating multiplayer (P1 gets to play until they die, then P2 plays, etc.) works with the NES emulator Little John, but not simultaneous co-op play.
GPengine hasnt released the version with the RF link yet and fnes hasnt been anywere neer a release yet.
Still the SMS will do multiplayer and soon the GPengine will to (i am hoping for a newer release but isnt he putting in savestates b4 the next release?) and fnes will come soon.
Maybe ask Yoyofr if he will do RF but i dont know if he can u have to ask.