... Wow. You might just have way too much free time on your hands. No offense intended. Its just that it's such an in-depth post on a relatively trivial topic (in my opinion). I think it's really cool that you use Latin regularly though.
Anyway. I've always just said "Focuses". If someone seriously tried to correct me on that in real life, I'd probably just laugh in their face... not the kind of person I'd want to be hanging out with.