I've been wondering about a 3 position safety for a 10/22.
Fire-safe-fire, maybe with an extra-strong detent system. And knurl the damn thing so it's easier to use with sweaty or frigid gloved hands.
Make it ambi.
Definitely not the most foolproof "safety", and I am generally one of the "ree use it as it comes hurdurr" crowd, but it would be nice. Generally I just use mine right handed.
Namely when I'm sitting in the stand trying to thin the squirrel herd, it's annoying to have a shot come up on my far right (lefty shot) and have to work the safety awkwardly. I'm not going to sit there with it off, and sometimes you gotta be quick on the tree rats. So I miss the opportunity a lot.
My right handed wife also uses the gun a lot, so I don't want to convert it to a left-only safety.