my secondary winches are on the cabin top and are generally only used to adjust halyard tension and trim spinnaker sheet when wind stronger than can be handled by ratchet blocks
I'll post a photo of the layout, I'd guess that you could use the secondaries to adjust the jib when on the inner tracks
Sheeting the genoa from the outer jib track back to the cabin top would be at the wrong angle, put too much load on the genoa track, and put the trimmer in a location where he/she could not see the leach of the genoa. In stronger winds, we occasionally cross-sheet to windward side so the trimmer does not have to move weight inboard.