For the trap wires, I agree with above, you do whatever you prefer. The grommets just give you the option of leading the bungee through the tramp. They help to keep the trap wires more organized.
The thing I always found annoying on the 16 was that if you were trapping in marginal conditions, the skipper would come in at the back of the boat and disconnect his trap line. The trap wire would be all the way near the back of the tramp. If you then needed to sit forward on the tramp, your hiking stick gets fouled up in the trap line. With the grommets, all the wires return to one spot, so fewer chances for fouling the hiking stick.
I would probably rig up the jib halyard to pull the mast forward while on the beach, or simply move the forestay down in the bridle adjuster to move the mast forward.
The main halyard you can wrap around the mast or lead the lines back and tie off to the rear crossbar to get them completely off the mast.