line controlers, line stoppers, clutches
Well, what do I know. You have the jib sheet, the mainsheet, and the genakker sheet for running rigging. You don't have the main on your cabin top. Whatever foresail you have in use you have it wrapped around the winch and either selftailed or held to a cleat of some sort, and those winches are usually on your cockpit coamings.
On San Francisco Bay you better have big winches on your coamings or you will loose jib control.
If you are talking about the halyards, vang, reefing lines if led aft, cunningham etc on the cabin top, they are usually led thru line controlers near and in front of a smaller winch on the cabin they all share - on the port side and/or the starboard side at the end of the cockpit by the companionway.
Line controlers or clutches are (in my limited experience) fairleads that clamp the line, holding the line from going back from where you pulled it, but will allow you to pull it toward you by hand or on the winch even if the clamp is closed. A wonderful feature. Each unused line is held tightly in the controler. Or a single line can be left loose if you so desire. You can release the clamp on a single line to let the line move freely.
Don't understand how jib sheets could be led over the cabin top, even on a Commander? :confused: