[QJ-6811]

I think you mean this? (CTN site)

Variable_Trigger - This trigger start when a certain 'variable value' is reached. It takes the form of Variable_Trigger ( x y ) where x = one of the variables described below, and y = play command as described below.

These variables include the following:
Speed_Inc_Past, Speed_Dec_Past, CurveForce_Inc_Past, CurveForce_Dec_Past, BrakeCyl_Inc_Past, BrakeCyl_Dec_Past, Distance_Inc_Past, Distance_Dec_Past, 
Variable1_Inc_Past, Variable1_Inc_Past, Variable2_Inc_Past, Variable2_Inc_Past, Variable3_Inc_Past, Variable3_Inc_Past.

Indeed, 7 different variable total. (written by myself..... :) ).
I think in previous post is meant an extension to Variable 1,2,3 for Electric/Diesel/Steam? (BTW, Variable 1,2,3 also have different functions depending on Electric/Diesel/Steam !!!)
So an extension to this is always positive, it must of course be well described/searched out what exactly the function is/will be for a new variable xx.
(And will be invisible in the current Sound debug......).

Again, I am also in favor of extension, but not modifying/changing existing functions!

[Weter]

Yes, I did:
BC, Curve force, speed, distance- in addition to three MSTS Variables.
Also, I've noticed about different function of these three for different traction types too.