Single Left Middle Right 
Plain: SelectJoint SelectSegment ExtendSelect
Shift: CaretPos AddLine AddBox
Ctrl: Drag Rotate Scale
Ctrl-Shift: DeselectJoint DeselectSegment (ExtendDesel) 
Double Left Middle Right 
Plain: SelectTopLevl SelectTraj SelectWithBox
Shift: NoOp AddLine NoOp
Ctrl:  CopyAndDrag NoOp Skew
Ctrl-Shift:  DeseleTopLevl DeselectTraj NoOp
Meta Left Middle Right 
Plain: ExtSelJoint ExtSelSegment ExtendSelect
Meta Double Left Middle Right 
Plain: ExtSelTopLevl ExtSelTraj SelectWithBox
Keyboard Ctrl Ctrl-Shift Shift 
A: Drop Anchor Lift Anchor
B: ToggleShowColors NoOp
C: Close NoOp
D: SelectAll NoOp
G: GravityForward GravityBackward
H: AddHoles NoOp
J: AddJoint NoOp
P: AddControlPoint DeleteControlPoint
Q: ToggleAlignments KillAlignments
S: MakeHot MakeCold 
DoubleS: MakeAllHot MakeAllCold 
W: Weld Weld
BS DeleteCaretSeg DeleteCaretSeg DeleteCaretSeg
SP ToggleGravity ToggleGravity ToggleGravity
DEL Delete Selected Objects
ESC Interpress Snapshot
CR Close (same as ^C)
Look   
x IN [0..9] line width x for selected objects
A curve style ARC for selected objects
B curve style B—SPLINE for selected objects
C curve style CONIC for selected objects
L curve style LINE for selected objects
N curve style NATURAL SPLINE for selected objects
Z curve style BEZIER for selected objects