Timed attack seems to have similar code to serpent strike. It looks like it uses physical only for all the attacks that timed attack generates. The easiest way to test is to wield a fire weapon (whip/sword/etc.) and perform a timed attack with the special noun damages on. You will see that the normal melee is fire damage, but the timed attack is normal physical attack.

Is this supposed to happen? It is very strange that all the attacks don't ever use any of the damage type of the weapon. Is this a bug or by design?

Also, timed attack does not fire the maran weapon fire prog either at all. Which is strange since it seems to fire on everything else and I know it works on all warrior specs, and basically every other attack. Is this also by design or a bug/oversight related to the previous bug about off-normal serpent strikes?

Timed attack does not use the damage type of the weapon.