Material Editing:
i would prefer to right-click on texture/map/map-slot and a menu appears showing these options:
1 - Edit map => Max opens texture or map in photo-editor (i.e photoshop)
2 - Open in MEditor => Open the texture in the Material Editor and Show the links where it is linked (to Materials and other slots)
3 - Cut/Copy/Paste
4 - Show => Max shows the texture in an image-frame as a preview to the user with its basic parameters (size, format, color depth, dimensions ..)
5 - Used or Unused (that means this texture is On or Off or simply it is assigned to unused materials)