I agree. How about playing the poison wind globes in the following way:
Width: small blast template
Effect: Roll to hit as usual (no penalties for throwing), If a target is hit he must make a toughness test (always failing on a 6). If i misses with 1 (i.e. rolls 4 with T3) he is Knocked Down. On a roll of 2 or more of the targets toughness he is stunned. The toughness test is rolled by the player controlling the hit target. A poison wind globe can never kill.
These makes them slightly different from the WHFB Poison wind globes - more like a stun gas, which I find quite neat.
ps. Ever played Desperados Wanted Dead or Alive? Remember the Doc.s 'knock out gas' and you should get the picture of what I was having in mind.