Hiya.
As [MENTION=6688285]Blackwarder[/MENTION] said, I thought about it as well...and quickly discarded it as a bad idea. I figured if I did do the Ad/Disad = No Change, I'd end up with players (and myself) trying to think of things to get Advantage or give Disadvantage. Basically, all that would be accomplished would be, effectively, the removal of the whole Ad/Disad thing in the system. I mean, at that point it's really just using the words Advantage for "+#" and Disadvantage for "-#" (e.g., This gives +1, this +1, that +2, and then we have this for -2, and that other thing for -1...oh, and another -1 because of X...so, uh, +0 I guess?). The entire premiss behind the Ad/Disad system is to do away with trying to add up all the positive and negative "modifiers" in a situation in order to streamline the game.
So, uh, no. I'm not doing anything of the sort. If an Advantage for X, but Disadvantage for Y and Z...it's just a flat roll as Ad/Disad is more or less an "all or nothing" mechanic.
^_^
Paul L. Ming