I'm with you cubefx! I love the roof on my passion. It makes me feel like I'm outside when I'm driving, sort of like a protected, more comfortable motorcycle (with just a smidge of imagination). I too wish it at least popped opened across the back about an inch, like a sunroof to let the heat out while parked all day in the sun at work.
I have those thick custom fit sunshades for the psuedo sunroof and that huge front windshield for both my Smart and my MINI cooper. I keep the shade in both roofs all the time in the hot Texas summer and pop open the back of the MC sunroof an inch which does let the built up heat out.
I love the smart, and feel like I've got myself a street legal golf cart (only better of course). Vicki