Motion 5: Change scrolling increments

Hello fellow FCPX/Motion users

I'm currently working on a FCXP-Title to create some kind of Smartpohone-Messenger. To scroll up the messenges when a new one pops in I created a Rig with a Slider for the Y-Axis. This works fine, there is only one thing that bugs me: when i want to keyframe the Rig in FCPX I'd love to just scroll in the numbers-field next to the slider to move the text upwards. But one single scroll on the mouse corresponds to a 10%-jump on the Rig-Slider which is too much. So to work precisely i need to manually type in the numbers (eg: keyframe a: slider at 18.4% -> keyframe b: slider at 23.4%.
Now I ask myself if there is a way to change the increments of scrolling for that Rig, be it in Motion or FCPX (from 10% to 1% or even better to 0.5%)?
Have a look at my screenshot to understand better what I mean.

First up, I assume you're rigging the Y parameter of a Group. I'm playing with this and getting very smooth results. Not sure why your changes are so drastic. I'd like a copy of your project to experiment with (benb at bbalser dot com).

If you go to the Slider layer, there's a Max and Min to set to control the range limits of the slider. Not sure if that helps.