SkinHelper

• Select by weight:
• Select Button:
• Left Mouse: Select verts with a weighting greater equals tollerance value.
• Left Mouse + shift: Only allready selected verts with a weighting greater equals tollerance value.
• Left Mouse + ctrl: Keeps current selection and adds verts greater equals tollerance value.
• Right Mouse: Inverts vertex selection.
• Right Mouse + shift: Select verts with a weighting smaller than tollerance value.
• Right Mouse + ctrl: Deselects verts with a weighting greater equals tollerance value.
• Deselect Button:
• Left Mouse: Deselect every vert, which is affected by the current bone.
• Left Mouse + shift: Deselects verts with a weighting greater equals tollerance value.
• Left Mouse + ctrl: Deselects verts with a weighting smaller tollerance value.
• Quickbuttons ("1", ".1", ">")
• "1": Set tollerance to 1.
• ".1": Set tollerance to 0.1.
• ">", Left Mouse: Step forward through a list of preset values.
• ">", Right Mouse: Step backwards through a list of preset values.
• Save & load selection:
• The vert selection will be stored in the skin modifier, outlasting a 3dsMax shut down (if you saved the file ;)).
• Remember Button:
• Left Mouse: Save selection to slot 1.
• Right Mouse: Save selection to slot 2.
• Reselect Button:
• Left Mouse: Select slot 1.
• Left Mouse + ctrl: Deselect verts, which are NOT in slot 1.
• Right Mouse: Select slot 2.
• Right Mouse + ctrl: Deselect verts, which are NOT in slot 2.
• Mirror selection:
• This does only work, if your root node is an Editable_Poly and no vertex modifying modifiers are between Editable_Poly(root) and Skin.
• Sometimes you need to adjust the spinner aside, by default 10 should just fit your needs.
• Mirror Selection Button:
• Left Mouse: Mirror vert selection.
• Left Mouse + ctrl: Add's mirrored selection to vert selection.
• Shrink, Grow, Loop, Ring:
• Left Mouse: Default function.
• Left Mouse + shift: Default function and deselection of vert with a weighting smaller than tollerance value. (So initially selected verts get deselected too.)
• Set Weight Slider Rollout:
• Experimental weight slider. Let me know if this one helps :)

Your Skin Modifier needs to be named: "Skin".
Mirror Selection value and Tollerance value will be stored.