Take it a step further, and require optional direction indicators. Not only do you get click on screen. You also get a little arrow pointing to which direction it came from. I have several friends with a bad ear. They can hear fine out of one ear, but not the other. That direction indicator allows them to track sound cues that would otherwise be useless to them.

The newer God of War games were pretty good about this, for instance. There were collectable crows, which were usually found via sound cues; they would loudly caw for you to be able to track them down before you saw them. But if you only have one good ear, you can’t tell which direction the sound is coming from. The direction indicator bridges that gap.