Edit: Also, Tonfa would be a great Monk weapon.
On the subject of Monk weapons... it would be nice to have alternate weapon designs in general.
Mechanically, Tonfa is a Club... and I've seen nunchaku variously suggested (in PHB and DMG) as either a flail or club. That said, this is sort of a later thing since I'd rather them spend time on getting the major elements of the game working.
