Thats fair. Though in this case the rule isOn the one hand, sure. On the other hand, the game is already pretty complex at the baseline, so I'm not terribly eager to add in a bunch of optional rules.
Deceptive Attack (p. B369): For every -2 penalty you choose to your attack roll the foe gets -1 to his defense roll. You may nor reduce your final effective skill below 10 for this.
Feint (p. 365) is a bit more complicated since its written up as a Maneuver (or action) but basically is a quick contest of weapon skills. If you win (roll better than they do) your next attack lowers their defense by 1 for every point you won by. Again its a little more complicated since it describes what happens if you succeed and they fail, you both succeed, etc.
I find Deceptive Attack to be more popular. Its more of a penalty but you dont give up an attack to do it.