Negative values for morphs not fully functional

[GH-Fox]

Hello,

I noticed that some imported morphs that include negative values are not fully functional when they can range to a negative value (see #133).

Using the latest version of the plugin (204.2.8.63), on Blender 4.2.0, MacOS 15.16, using a default G9 with no morphs applied.

In this example, the morph Eye Look Side-Side works for the shape keys from -1 to +1. But the associated eyeball rotation only works for 0 to +1

Positive value:

Rest:

Negative value:

Happy to run more tests or provide details if need be.

Thanks,