Soft Selection is a very used in the projects pipeline and its Improve can help to upgrade the quality level of the workflow in Max.
Some ideas:
-Reset toggle for reload defult soft selection parameters.
-Soft selection mode for selection Influence area:
1- Object: only affect on selected object.
2- Element: only affect on selected element.
3- Scene: can also impact on non-attachment objects.
-Invert Soft Selection curve affect area.
-Preset curves pack for fast access to other curve styles.
-Ability to change selected area hue colors for better view on textured objects.

Also these great ideas can help get better soft selection workflow:
1- Modern, Unified Curve control :
https://forums.autodesk.com/t5/3ds-max-ideas/modern-unified-curve-control-to-replace-the-numerous-co...
2- Better soft selection's Gizmo Position:
https://forums.autodesk.com/t5/3ds-max-ideas/vertex-soft-selection-pivot/idi-p/7282796
3- Soft Selection shortcuts:
https://forums.autodesk.com/t5/3ds-max-ideas/soft-selection-shortcuts/idi-p/7339360