Certain UI elements in Ableton are too sensitive for fine mouse adjustments. The ones that annoy me the most:
Transpose of Simpler
Envelope of Simpler (down-right from transpose)
Track delay
If I click these controls with mouse and adjust them, I often need to draw mouse a few times up and down before I end up to the value that I desire. Even when holding ctrl down I still have this problem
I would start to try by reducing sensitivity to half (lets say that now it takes 2mm of mouse movement holding ctrl down to change a single step of transpose control, I would start by changing this to 4mm)
Track delay is far too sensitive. It is almost impossible to hit the right value by dragging mouse up/down. It also seems to ignore holding ctrl down. 1ms or 2ms can make a significant difference to sound in certain use cases and still it is very hard to set the value with such a precision (unless you write it from the keyboard which is kind of slow).
Developers should try Fabfilter Pro-Q. It excels in these kind of things