There is a Trane publication called "SERVICE FACTS" which I received with my UD080R9V4K furnace/air handler. It contains much info on airflow and DIP switch settings. Probably your tech decided you did not need to have this manual, but if you ask him I bet it is available to you.
I did not see the admonition to turn off power before changing any of them, so must confess I just opened the panel and set them. I believe I was imitating what the tech did. My tech knows I did this and he seems to be not alarmed. Just concerned that I can explain what changes I made and why. One of the things I did was set Comfort-R to on, through an oversight he did not. When the duct noise was excessively loud, I set airflow to 350 cfm/ton which is recommended in humid climates.
On the second system when we learned it was really 3.0 ton rather than 3.5, I reset airflow to be 400 cfm/ton. Thru our mistake it had been running all summer at 465 cfm/ton which is not supposed to be ideal in a humid climate.
It is my opinion these changes are not controversial, however I am also very concerned about safety and not harming my equipment thru my own blunder. So far it has worked out OK, I hope it is knowledge and not just dumb luck<g>.
Hope this helps -- Pstu