Getting in and out of vehicles
...kind of sorta, but you still need to deploy the stock to use it, barrel length will cause more issues than the butt (as the butt will rise into you body space while the barrel protrudes)
.....same as vehicle really, barrel out front of you is more of an issue that butt back near you, folded you are basically carrying a club.
Smaller to strap to a pack
.... yes but unless you are jumping from airplanes strapped to your pack is really no place for a rifle
Don't get me wrong mate, I think the para is as cool as all get out BUT as long as you know why you are spending the extra and the limitations of the design.