Custom constants and variables

[EmilioPlumed]

It would be extremely helpful to be able to define constants like pi, frames-per-second, or initial/final values for keyframe parameters and prompt weights.
Moreover, being able to condense expressions by definitions such as "sinwave=sin(2*pi*fps*t+ang_ini)" would also be very useful.

Granted, I have never used python and I don't know how hard it is to implement this.

[kabachuha]

Sounds like a good feature!

[EmilioPlumed]

Maybe the easiest way to do this would be with string replacements.
Then the only tricky part would be the handling of nested definitions like:
pi=3.1416, fps=30, T=5, freq=1/T, w=2pifreq
"strength_schedule": "0: (0.6-0.1sin(wt/fps))"
Which could be solved "lazily" by enforcing a strict definition and substitution order (top-down, bottom-up in this example), or a more complicated contain check.