Parenting Values to a slider accounting time over value

[Charles Okland]

Is there a way to create a slider that rather than sets the value of a property to the exact number the slider lays on, takes account of the furthest keyframe of that property to the left, and the furthest to the right, and can space between these two by going up and down the slider? this is already a feature in the duik bassel/angela plugin, but with that you have have a slider layer in the comp viewport rather than in the effects. let me know if you have any ways to achieve this or if I should re explain it, (and no I don't mean applying time remapping and parenting to the slider)

[Dan Ebberts]

I'm not sure if this is what you mean, but maybe something like this:

t = time;
if (numKeys > 1){
	s = effect("Slider Control")("Slider");
	t1 = key(1).time;
	t2 = key(numKeys).time;
	t = linear(s,0,100,t1,t2);
}
valueAtTime(t)