【Chrono::Vehicle】Shifting gears while the vehicle is running

[Shunya]

Dear all,
I have questions about "demo_VEH_TrackedJSON".
Q1:Is it possible to change gear from FORWARD to REVERSE while running?
   Also, is it possible to shift up while running?
Q2:If Q1 is YES,
   Please tell me how to operate it.
   (Rewrite the .json file? Rewrite code? Use the keyboard?)
Q3:If Q1 is NO,
   What parts of the code need to be modified to achieve these?

Background of questions:
I am making the vehicle runnning model in Project Chrono, referring to "demo_VEH_TrackedJSON".
I asked this question because I wanted to develop a controller that would slow down and put the vehicle in reverse gear when the vehicle is running and leaning.

Best regards,
Shunya Shimada