The Events(Inputs) and Variables(Outputs) numbers used in the rkssoftware drivers are specific for rksoftware and are therefore only to be used in scripts for the rksoftware drivers.
The Events and Variables themselves which I am using in the drivers and scripts are all found in the PMDG airplane's SDK, see in MSFS's Community\pmdg-aircraft-738\Documentation\SDK\PMDG_NGX3_SDK.h
Some of these Variables are not given number in the driver software as the function for variables are not used in the Opencockpits hardware modules.
But even if they are not used in the Opencockpits modules, but requested by a rksoftware driver user, I will add them. Example of this is the TakeOff and Cabin Altitude variables.
The pedal variables you have asked for is not in the PMDG SDK, therfore I can't / will not add them to the driver.
i believe the pedal variables you are seeking is joystick variables that can be found in the FSUIPC software.
SIOC scripts can use FSUIPC variables in the script for the drivers so it is possible to embed these functions.
There is a TQ script example somewhere in the Forum here.