Without getting into the API, the only way to track those values would be through character sheets. The GM can modify character sheets as well as the players' if permissions are setup. (I think you had asked this already Adding Bars or Modify Mutiple Attributes during play If you create a vehicle character sheet, and link a token to it, you can also make Abilities that your players can use as macros to communicate the current status. You wouldn't be able to update the values with a macro, but if set correctly anyone could update the attributes in the vehicles character sheet.
