What if an "ice touch" (1 pt cold damage) weapon, was also lesser fire resist?
Or a "flame touch" (1 pt fire damage) weapon was also lesser cold resist?

You could take that further, and make a weapon that does 1d6 cold damage, be a higher fire resist, and vice versa.

Not only would these changes be ... more realistic (sort of) but they would be even better against their primary foes.

I am NOT saying do this for all such weapons, but I would not argue against that, I am just thinking that a line of weapons that would do this would be attractive. They can be name, or crafted, or ... whatever!

Maybe in a future event?