[cleveland]

Nope, only applied secondary effect of stun to all weapons that both (1) had no secondary effect, and (2) weren't already dt_stun.

Any weapon that already has a secondary effect will apply that effect, which in turn will apply stun damage.

For example, if the original weapon #1 had secondary effect of weapon #2, only weapon #2 has been modified to produce stun effects.

So with the mod enabled, you hit with weapon #1, which applies weapon #2, which applies stun damage.

Was that even remotely lucid?