Panel digits seem to be a bit useless outside of Lite-C.

If you want to use ints or floats in C++ you can't do the necessary var conversion.

If you want to use other non-C-compatible languages you often can't pass a variable pointer at all.

My suggestion would be an update callback mechanism for digits. Instead of a var* pointer each digit(slider,...) can optionally get a function pointer. The return value of this function (which gets called every frame) sets the value the digit displays. There should also be a user data parameter which gets passed to the function.

Or maybe someone has a better idea?

This should be easy to do without a callback function. Just run a function every frame that converts your observed variable to a global var.

var digits_var = 0;

...

void convert(float fObserved)
{
digits_var = _VAR(fObserved);
}

Okay, I will try to do it like that but it's not so easy because I will have to write a lot of code which keeps track of every digit in my wrapper. I don't use C++ and don't know beforehand how many and what vars will be needed and so on...