For that you need at least two bar positions, which drop bars, Euro bars, or even TT bars can provide (see my threads on the Mauna Kea bike (Euro bars) and the M.K'denza (TT bars)) and a flat bar cannot. Bar end "horns" on a flat bar do give a second position, but not enough to stretch out for headwinds. Since you can't pull on the horns on a Dahon (without some serious consequences), horns are only an alternate touring position.

As for the hinge, I think you got a lemon bike. The hinge should not creak.