Theoretically, yes, and it's been added now, but unfortunately it takes some time for the changes we make in the Incubator to be active for users (sometimes as long as two weeks).
Still, please report (with the button in the lesson, not in the discussion) if it's not accepted, it's still possible something got missed!
Time and user reports. With experience we get pretty good at remembering what we need to add, and when we remember something new we check the similar sentences to make sure it gets added to them too. And as time goes on, users report more and more of the possibilities we missed, and we add them. But it does take a lot of time and the prpcess never ends, no course is perfect!
I believe there are 8 or 9 of us currently actively working on the course. A few of us (me included) are just temporary help with the initial flood of reports.
I don't know how many hours I personslly put in on the Latin course. I work in many places on Duo, and I don't track how much time I spend on any one particular thing.
Sometimes it's hard to report because the relevant option isn't available, as for this question - the button options are: The audio does not sound correct. The dictionary hints on hover are wrong or missing. The Latin sentence is unnatural or has an error. I'd be hard pressed to choose any of these as a way of saying "my answer should be accepted" ;).