Speaking of neat MSR binding trick - I like to double up on the strap clips. I install them so they face in opposite directions. I find this helps prevent loose ends from flopping around and coming loose.
I find doubling up on clips also helps keep rear heal strap where I want between outings.
For the heel strap on the new Paragon bindings they use a closed loop instead of an open clip. I'm sure they will make that piece available for sale on its own to retrofit the Posilocks.