Improved snapping options

Hello,

1. Is it possible to enable toggling on/off for all components in snapping options? Like MMB in snapping bar (I just discovered it!).
   For example ,if I need to have snapping on grid point, edge mid point, face and polygon center enabled I would simply toggle them on/off.
   Maybe even add "Snap to all" to the list.

example





2. Add "snapping tolerance/ strength" value slider to snapping options (can be added to preferences in the list with "hard edge threshold", "vertex size" etc).
   With this option you could customize the snapping precision. This could be visualized by rectangle around the manipulator, like so.
   


3. Add small "s" to cursor when snapping is enabled.

edit:

4. Remember snapping settings upon program restart.In both snapping bar and menu (consistent).

5. Perhaps move the menu to "Manipulation" menu, as it is too deep as it is now.