luni
Observer
Okay Luni, after a little more analytical thinking, I get what you're saying. With the COs designed as they are, when you adjust the preload, you're NOT adjusting the overall length of the shock, you're simply adjusting where in the range of motion of the shock the resting place is. With the adjustable length CO, you would change the overall length of the shock without adjusting travel which could cause issues regarding to range of motion.
Exactly
As far as the squeaking goes I had more noise out of the uniball on my TC UCAs than I did from my coilovers but right now I'm getting a lot of noise out of the heim at the LCA. Some PB Blaster quiets it down for a day or two but I'm due for a rebuild any ways. I figure pulling them out for a thorough cleaning would probably do the trick too.