The winches on the cabin top by the companionway could also be for topping lift, pole lift, spinnaker halyard or related controls. Mine are so marked. The spinnaker sheets, by contrast, are brought right back to the stern quarters, around a block and forward to small spinnaker winches. I agree with Jeff that the "clam cleats" and seemingly excess winches are indicative of IOR early '70s racer-cruisers. They aren't excess so much as superfluous if you don't have a crew of six in 20 knots to work the boat.
As for the staysail issue, it is possible that the "staysails" you have aren't traditional, but are "genoa staysails" that tack to the rail and are led back to the cockpit to an auxiliary winch. Rarely seen these days, they were a way to create a slot on a reach on those boats with long
Js to really power up the foretriangle.
Here's a nice little explanation about the staysail on these types of boats:
Team Celeritas.com Results/Blog » A good article on trimming the staysail a must read!
Conversely, if they are actual staysails, is it possible that the staysail tracks were removed from the coach house top? Is it possible that a second set of cars is used on the existing track?
By the way, the clearest explanation I ever saw about why and when to use the 1970s arsenal of sails is in Wally Ross's "Sail Power", about the best book I ever read about sail theory and practice, even though it is largely outdated now.