I think that the rule against dragging foes into dangerous areas are a major drag (and now the source of a terrible pun). I’m also not sure why Drag and Reposition deserve to be separate maneuvers. Is there a doctrine of “Separate but Useless” in play?
If the Trip weapon property gave you a +2 on Trip attempts that would not only make you less likely to fall down but more likely to succeed. I guess maybe somebody was concerned that Trip was too powerful though. Maybe that's the same reason you can't Trip flying creatures in Pathfinder. Grapple is another combat maneuver that tends towards "Dominant or Useless", but I'm forgetting this is actually a thread about improvised weapons...
@Artfix - The fact that there are a few class abilities which make improvised weapons a bit better doesn’t change my opinion of how they are “in general”. I’m not sure that making improvised weapons as useful as “regular” weapons is something every table would want although Sean K Reynolds’ opinion on water balloon based PCs has apparently changed a bit over the years.
@Fig - I may indeed have seen a movie featuring such a character! My PC was a from an Asian themed nation around Tian Xia and ate with chopsticks but found a use for forks too.