Being able to ride without hands is largely a function of the amount of trail on the front wheel. IIRC the tikit has about half the trail of a racing bike, which is sufficient to do the job; I believe the Bromptons and most Dahons have much less than that. [FWIW: Dahon has a history of fairly low trail.]

BTW: I can't reliably ride no-handed on my Tikit, because it tends to lean subtly to the left when I do so. Rob English says this was due to a minor bike flaw in the tube latch assembly which BF has since cleaned up.