believe me.. the RS4 is nothing like a BMW- in any dimension- that thing is a beast!,
my gf has a TT , the 3.2 Quattro 6 spd ..hers had some modifications but essentially stock standard...I borrowed it when last in NZ, it was fun to drive and very quick but had many negitive points ( not mechanical) including a no go zone for the rear seats like u said ( not sure why they are there?) only for midgits I think... and some door issues. all in all a fun car!
Agree about the RS4, fantastic car.
No Lotus Carlton though...
=P