I would recommend checking release notes for that.
No mention about this anywhere, at least in the english patch notes.
Yet
this page on BG-wiki claims that, at least during footwork, the damage on the weapon is added to the kick damage.
That would be quite a huge difference that would be easily spottable even without any specific test. We're talking about ~180 damage difference here, pretty noticeable.
That's
supposing the info on BGwiki are correct, I'm skeptic about it even though it would make perfect sense.
If Byrth is correct (feet equip still give +damage) then a Monk with Godhands and Anchorite's Gaiters +3 during footwork would have: 278+20+20+120 base damage, for a total of 438 which seems pretty huge if you ask me.
I don't think that's the case so either BG-wiki is wrong or Byrth is or both, I dunno.
Any testing would require capped attack. Without that the multiple "+attack on kick attack" bonuses would skew the test and make it difficult to tell the difference between base damage increase and attack increase.