I don't think it's needed for roads or cities, but farm can be large and complicated, and there are some tiles when one can be in doubt whether the farm stops or continues.
(I remember once I have encountered a bug in farm area computation, where I couldn't add a pig to my farm. I admit, it was a huge and very complicated farm, but it was connected.)
It would be nice to have a highlight of the whole farm when moving mouse over it, say, with a lighter color. And as a bonus it could show how many cities the farm touches.
I don't think it's needed for roads or cities, but farm can be large and complicated, and there are some tiles when one can be in doubt whether the farm stops or continues.
(I remember once I have encountered a bug in farm area computation, where I couldn't add a pig to my farm. I admit, it was a huge and very complicated farm, but it was connected.)
It would be nice to have a highlight of the whole farm when moving mouse over it, say, with a lighter color. And as a bonus it could show how many cities the farm touches.