Adding more pit lane sensor tracks will work, but will take up a lot of space on your layout. Here's my current pit lane set-up. It is a two bay pit.


You can see the space it takes up. I use a chicane piece for my pit entrance and exit, so it could be shorten by two track lengths there. But if you want more than two bays, the crossover track will have to be changed to a double LC and then another for each additional pit bay. I had mine set up with separate pit bays with a double LCs between each bay. During races people were not getting into the right bays and sometimes not in any pit and having to go around and try again. This really took the fun out of it, most times we would run races without turning the fueling on. So I went with this setup, this way once you switch into the pit lane you will end up in one of the pit bays.
Randy