Hi Slowy,
I've been using fixed back race seats (ADR approved) I've got them on runners but I'm also using the L shaped brackets and the bolts thru the side to hold them in place. It's pretty straightforward to undo the bolts and reposition the seta to raise and lower it front and back.
I like Boxhead am looking at more road friendly seating options. I'll keep the race seats as they are great on track days but I want something a bit more civilized for day to day driving.
Cheers