That's a great looking list!
If you have limited site selections I definitely concur about longer straps. My "deluxe" hammock setup has one 6' and one 8' straps, but my light setup uses two 4' straps which assumes I can just keep hiking until I find a suitable spot.
For reference, my 10' DIY hammock with whoopie slings, 4' straps, and toggles made from arrow sections weighs about 9oz even, and it's pretty hard to beat for ease of use.
When I first started hammocking I did find a fixed ridgeline to be useful, but with practice I can usually get a good hang the first try now.