I have a flickering lightbulb. It consists of a point light and a lightbulb mesh with an emission material for when it's on.
I'm using a noise modifier to variate the lightbulb power, but I'd like to link the power value to the emission strength. I know I can just copy the modifier from the point light fcurve to the emission, but it's a hassle. I change one I have to change the other. Also consider the emission strength is exponential in its visual effect - 0.0 - 1.0 massive variation, but as you get higher the difference is less and less noticeable, unlike the point light where the strength value has a comparatively linear effect.