Hi Chris, though I think it sounds like a nice idea, personally I am not sure if it would work exactly as mentioned, based on a few reasons;
-First of all, I don't think there is sufficient output of traffic intensities for now. Of course those can be found in the ailist settings. But I think BBS must check those ailist files several times during a trip to let it work. And I'm not sure if it is possible to increase.
-Secondly, traffic volumes may differ for every player, depending on their own settings (those are typically based on the performance of their PC). This may result in unfair competition between players and companies with high-end and low-end PCs.
-Finally, I think your goal is already met by current settings. If your settings for traffic are higher, there are typically also more passengers at bus stops willing to take a ride. And more of them means (to certain extents) more income already, if I'm right.
Thank you for your consideration,