As I remember, Dex was counted in chance to hit and number of attacks per round, while Str add physical damage to your hit.
Can't say it's obvious place for adding End and Int for attack skill.

You know, in some games you can "train" skill that allows you to use "wis" / "int" stats instead of "dex" in "to hit chance" calculation. Could it be considered as alternative for multistat skills?