I never wheel mine, it's just too awkward. I carry it
I lent it to a friend, who's a small woman, who "wheeled" it by dragging it along the ground and bent the little foot that the bike balances on.
I can't see any way of adding 2 extra wheels, but if wheeling was important, this would be a required upgrade:
http://www.bikeforums.net/showthread...=1#post9760661
Also, I'm not sure the mezzo is geared any higher than a brompton: I'm not a bicycle weenie, so I haven't got my head around gear ratios, but I don't think the top gear is very high:
http://www.mezzobikes.com/UK/d9specs.php and
http://www.mezzobikes.com/UK/d10specs.php
That being said, I love my mezzo! I'm doing 100+ miles a week on it, and I'd buy another one in a second if something happened to it. Actually, I'd hum and hah over the brompton for it's suitcase sized fold, and the tikit for speed of fold, then I'd buy another mezzo. D10 probably: gotta love those curves