Yea I was wondering the same thing, just a pull of a pin and you got 4 more inches of travel, man imagine if everything was in pin form lol.
here is a picture of my temporay set up that i was running, it worked prettly good other than one side always inverting.
that is basically the desigh that you want but the top shackle should be a little flatter than the way i had it. if/when i do it again i will have a lot longer top shackle, maybe even with a jonny joint in the end of the shackle
