pawsplay said:Whereas does it any other way is very problematic when it comes to deciding whether you hit, how much damage you cause, and what "procs" activate. How would you do it?
Well, maybe you can choose which one is your primary weapon, and if you hit with your one attack, that's the "proc" you get and the damage you deal. You can't get both "procs" but I'm thinking that might be a feature, not a bug.
As far as non-proc benefits, like proficiency bonuses or other bonuses to hit granted by the non-primary, it's not as clear how I'd handle that. I'm already assuming you have a feat that gives you some simple bonus just for attacking with two weapons - flat +1 or +2 to hit, perhaps. Perhaps the feat would also allow you to apply some or all of the secondary weapon bonuses. It's hard for me to say what would be appropriate in a vaccuum, without knowing how high those bonuses might go.
In the end I don't see that a two weapon fighting implementation requires that the fighter be able to take full advantage of all the properties of both weapons.