As for rolling the bike, I've not found a way to do it that works very well. I've just been looking at this thread: http://www.bikeforums.net/showthread.php?t=439561 and I'll have a go with the handlebar method. So far I've been using the saddle; the most comfortable way for me has been to reverse the saddle, hold onto the seat post and let the indentation/cut-away section in the centre of the back of my saddle (not the stock one) lock into my forearm. Makes it easier to balance on one wheel (I'm going to try a Rido saddle this week and that has a similar shape). But should I have to get through a ticket barrier or something like that, I have to lower the seat post, and all the adjusting gets awkward, so I tend to just carry the thing. Which is also somewhat awkward. Which is why potentially the weight/comfort ration might be breached with a full suspension bike: I can imagine it being too cumbersome to carry, but it all depends on what the real-world weights are.