Originally Posted by invisiblehand
. . . Can you roll the bike while folded after extending the seatpost?
Yes, although I have only done this a very short distance to see if it would work. Haven't tried it in difficult real world conditions, such as weaving through crowds at a train station.
Can you fold the bike with the klickfix bag on the front? . . .
There is a large bracket (has to be bought separately) which attaches to the head tube and stays on the bike. That does not interfere with the fold. The Klickfix accessory I bought is a wire basket, and no, I wouldn't be able to fold the bike properly with it on there.