I've been experimenting a bit. Have found a way to simplify the ridgeline idea, just requires more adjusting.. not sure how I feel about it. Doesn't require any holes, but involves tensioning 3 lines instead of 1.
Re: the spreader bar loops, I've definitely hit upon something, just haven't had a chance to do the needed sewing. Small grosgrain strips which allow a shockcord loop to pass beneath are working well, for sticks and securing the netting when rolled up.
This one has to be redone, not where it belongs. On the end loops the grosgrain will extend to the top of the loop, which act's as the end "wall" for spreader bars, so no difference there. The SC works great w/ sticks though, as long as you can get them more or less balanced.