So, what is the best item for a "Dodge This!" section? I'm currently in the middle of building one for my fort. So far I've been using primarily wooden spiked balls, since I'd rather they fall instead of gumming up my trap.
For something like that you might as well just use a couple of surplus melee weapons, copper daggers or whatever. Even a stone-fall trap would suffice to force someone onto a pressure plate.
Yep, the really junky, no frills weapons go up on the dodge-this section. The nastier stuff goes down below at points where you are forcing them to walk past it to escape or press onward. My trap areas are designed so that it gets progressively more lethal as you progress towards the middle, and if you do fall down, you have to run the really nasty gauntlet to get back up top and escape.
I still prefer having (10) individual weapon traps with one weapon each rather then a single weapon trap with (10) weapons. Lets me cover 10x the area for the same cost (other then mechanisms). In special pinch-points where I really want more of a kill, I'll put one axe, one corkscrew and one disc in a single trap.
(Another use for the cheap / spare weapons is as a "no loitering" tool. Keeps ambushes from sitting around, watching their leader trapped in a cage trap. Or goblins that decide to hang around in the bottom of a trench.)
The other reason that I don't typically put multiple weapons in, especially in a dodge-this section - if there are multiple weapons, I think there's a chance that the enemy will teleport 2+ tiles away if they dodge multiple times before being moved off the tile.