Yes, just access the datablock members from script (console). Remember it is global so it will affect all vehicles that use that datablock. You could also create a gui widget to modify them is a more straight forward way. One thing you should check is that the values are grabbed from the datablock from the updateforces function. If you cannot determine that then just try it.
Torque Owner Demolishun
DemolishunConsulting Rocks!