Nick, I think this is great. I posted on the Youtube vid, but again, I think 1/2" is where you should focus development. A lot of rigging is done on 1/2" lines, and the cats who feel the need for 5/8" and 3/4" lines can take the time to tie the running bowlines in those applications. For rigging out limbs and light dynamic stuff, this would be sweet!
I like it. 1/2" is totally my vote.
ETA: Please get some different color 1/2" polydyne. Orange would be sweet, but anything other than white would be awesome. haha