Note: you can set all your keys in preferences/CSG Keys
Control-F2 Undock tool window
Control-F3 Enable/Disable realtime-CSG
H Hide all selected objects
Control-H Hide all unselected objects
Shift-H Toggle visibility all selected objects
U Unhide all selected objects
Escape Cancel / Deselect
Enter/ReturnCommit
Control-EndCycle edit mode forward
Control-HomeCycle edit mode backward
? Make selected operation pass-through
= or + Make selected brush/operation additive
- Make selected brush/operation subtractive
/ Make selected brush/operation intersecting
N Toggle Free-draw generation edit mode
C Toggle Cylinder-draw generation edit mode
B Toggle Box-draw generation edit mode
[ Half grid side
] Double grid size
G Toggle grid shift
Shift-T Toggle snapping
ALT-F1 Object edit mode
ALT-F2 Generate edit mode
ALT-F3 Mesh edit mode
ALT-F4 Clip edit mode
ALT-F5 Surface edit mode
Delete Delete selected free-draw shape points
Enter Create brush from current shape
Esc Cancel shape
M Merge vertices of selected edge
Control-End Snap selection to grid
hold D Drag a clone of your selection
hold Z Move selection up
hold Shift Move surface in it's facing direction
ALT + click Create free-draw shape from surface (click center point) to extrude it
Delete Delete selected vertices
Control-Shift-XFlip selected brushes over X axis
Control-Shift-YFlip selected brushes over Y axis
Control-Shift-ZFlip selected brushes over Z axis
hold D Drag a clone of your selection
hold Z Change move direction to up/down
Control-Shift-XFlip selected brushes over X axis
Control-Shift-YFlip selected brushes over Y axis
Control-Shift-ZFlip selected brushes over Z axis
Ctrl-Left-Arrow Move selection to the left (-X) with a grid sized step
Ctrl-Right-Arrow Move selection to the right (+X) with a grid sized step
Ctrl-Down-Arrow Move selection to the back (-Z) with a grid sized step
Ctrl-Up-Arrow Move selection to the forward (+Z) with a grid sized step
Ctrl-Page-Down Move selection to the down (-Y) with a grid sized step
Ctrl-Page-Up Move selection to the up (+Y) with a grid sized step
Control-. Rotate selection to the left (Y) with a rotation snap sized step
Control-, Rotate selection to the right (Y) with a rotation snap sized step
G Copy previous material to surface you click on
Hold G Smear material over surfaces you drag over