I too am looking for a small front rack, and my DaHon Curve seems to have threaded holes to which to mount a rack, but I haven't been able to find one that fits. I would only use it for light weight things, so I don't think it would effect the handling of the bike; or at least not much.
All the fittings I seen for the front of DaHons are for bags and baskets and I really don't want to got there. Any DaHon riders out there have an idea? I should probably ask this on the Folder Forum if not.
Rick / OCRR