Hi,
I also have the adjustable seats in my Sav S, and find them great. I am a short*rse at 5'4" so I have mine full forward and still have a cushion, but most of my passengers have the seat full back. Didn't fit them myself as it's factory built.
You need to have the central Y control stick, of course, and the manual flap lever is right in front of the seat. All good.
Cheers,
Neil