I dealt with these same questions when I was trying to figure out what to do about a bug net. I'd seen a lot of folks who just basically threw a net over the ridgeline, and while this might work, I didn't like the looks of it or the way the netting sags and lays all over you. I saw other ideas like the cinch cord around the bottom, velcro edges, zippers, etc. But the idea I liked most was simply weighting the lower edges. Here's why:
1- Gravity pulls evenly on the netting all the way around regardless of the shape of the hammock once you're in it, so the netting stays straight and off your face.
2- Ease of setup and use. Like you said, no need to thread the hammock through. Plus, you can toss one side over the back to get it out of the way when its not needed. The triangle "end caps" on mine have velcro on the bottom edge, so I just open them up and lay them over the suspension at the knot, then stick em together underneath. Nice tight seal!
3- It works! For weight, I used 5 or 6 ball bearings per side, sewn into the lower edge. Not sure of their size or exact weight, but they're not heavy. It works because the netting is so light, it doesn't take a lot to keep it pulled tight. If you picture the hammock with a person in it, the netting comes from the ridgeline down at maybe a 45 degree angle, folds over either edge of the hammock, and then hangs straight down. The net "seals" where it bends over the edge of the hammock. Flying bugs won't push their way thru this "seal", and keep in mind that anything that crawls has to find it's way down your Amsteel to even get to the netting. I just post little tiny "Keep Out!" signs on both suspension lines for the critters!
Seriously though, it's worked 100% perfect for me so far.