I've been looking for a nice steel core lanyard maybe 14 feet or so, I do like those bright colors, mine is getting pretty beat up. I do like a big lanyard for big trees.
1 or 2 spider legs and you could probably get away with trying to use a sling every pick. I've worked with crane operators that don't seem to be comfortable trusting knots, it's probably just a mental thing.... usually you can just have them cable up 20,000 lbs and make sure everything holds, wait for the thumbs up.