Seeing something similar here, holding shift will move the fader the same amount as when not holding shift, however it requires you to scroll multiple times to get the fader to move once.

Running W11 Pro with TMFX 2.01.

Yes, that's exactly what I am seeing.  I hold SHIFT, and scroll with the middle mouse button and it takes a few times before the fader begins to move.  And when it does move, it moves not by .1dB increments as it does in the old style TotalMix but in .3dB increments...

Same OS as you and same TMFX.

I have just tested on Win10. Without Shift the wheel moves fader by bigger (as high as 1.0) increments for low fader values (say -60 dB) and lower increments (as low as 0.2) for high fader value (say -5 dB).... Which is IMHO strange. Should not it be vice versa? 

And with using Shift... If one moves the wheel fast, the fader moves as one would expect (more slowly), but if one moves the wheel slowly the behaviour is strange... Sort of erratic. Sometimes the value changes with one wheel tick like there is no Shift, sometimes one has to make several (maybe 10) wheel ticks to change the value, but then the value again changes as if there is no Shift. (But evidently Shift is detected as one has to do many wheel ticks....)

I have TM 2.00, not 2.01 yet.