On second thought, you probably mean something like this:

Extend povray by a syntax such as

#parameter X = 5;
#parameter Y = 5;

for parametrizing scenes. This would be like declare but when
a render is started a dialog window opens with a property window
and allowing to change the default parameter values. Only after
clicking ok start the actual render.

But frankly I think it is not so convenient. Probably better to
write a front-end in another language that writes the INI file and
starts POV-Ray.

Note that you can also pass parameters on the command line
when starting povraz (Declare=IDENTIFIER=FLOAT).

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