Change scroll wheel increment in Effect sliders?

As we all know, for effects that let you change the value with a slider, there's also an edit box with the numeric value in it. One of the ways you can change the value in the edit box is by clicking in it, and using the scroll wheel on your mouse. This works well for some values - generally the ones with a large usable range. However for values with small usable ranges, each movement of the scroll wheel produces too large a jump in the value, for my liking.

I was wondering if there is a way to change this? I tried creating an effect template in Motion 5 (at which I'm a newbie), for Gamma, to see if I could do something to change this, but when I used a Rig Slider to publish the Gamma value, the jumps between each scroll wheel change were even larger! Clearly I don't know what I'm doing. 😕

In any case, if anyone has any ideas, please let me know. Thanks.

Dan