Hi Dick,
Footies, with unlimited sail area invariably have some part of the jib (or leading edge of their uni-rig or swing rig) overhanging the bow. Some diagonally placed boats may not if they have very tall rigs, but many have, and traditional jib and main combos almost always overhang. I suppose that a boat that is placed in the box to take advantage of the bowsprit slot could be rigged in the manner that you are suggesting, sheeting from the bowsprit, but I would be concerned about fouling one of the lines with the bowsprit if the jib/spinnaker should drop in a lull.
Similarly, on a diagonal boat one or both of the lines could get caught under the bow.
Also, if one was to have a forestay (which you probably wouldn’t use on a Footy anyway) it might interfere with the jib/spinnaker or have the thing get tangled if the wind backs.
I don’t think you would want the tack and clue sheets loosening progressively as you let the sails out. You would want the system to kick in when close to all the way out. For the system to deploy when the setting is for a broad reach to a run some sort of spring action trigger would be required. This would have to work both to let out the sheets and to trim them back in, and do it quickly for mark rounding.
In short, the engineering involved would be quite complicated and probably add significant weight. The boats that work best are the ones where everything is simplest and any systems employed work consistently. I don’t think that this can be done with the winch servo alone and perform reliably, but I’d follow with interest if someone were to tackle the nuts and bolts of making something like this work.
But I do agree that the RG65 platform affords more bow to work with and is more forgiving of internal weight than the Footy, so if one were to try and develop this system the RG is a better candidate.