No but I have also been interested in adding secondary winches on my 34-2. The problem is that the main genoa winches are somewhat in the middle of the coaming and the width dramically decreases as you go aft so this will limit the size of the winches if you go aft.
Ideally, I would prefer the main genoa winches about 12" or so forward and a aft lead block going ot the winch and a secondary set of winches aft, near the helm but they would need to be much smaller to fit, even with a stainless steel winch bracket. This provide additional options, especially racing and would allow me to set the spinnaker or free flying drifter (my favorite sail duirng the summer on Cheaspeake Bay) with a good aft winch and option to douse it and roll out the furling.