Direct Selection tool:

• Ctrl+click a path point to convert between straight corner and bezier.
• Ctrl+drag a path point to convert it into a bezier (make sure to start a curve with no loops always)
• Ctrl+drag a path segment to create a curve
• Ctrl+click a bezier control point to remove it and make that side a straight edge
• Alt+click a bezier control point to detach it from the other control point (independant angles)
• While dragging path point or control point, if Shift key is pressed, move it in 45º increments
• While dragging path point or control point, if Ctrl key is pressed, disable snapping
• Shift+click a path point to extend point selection. We should follow this pattern too for selecting elements in the viewport (let's leave the Navigator as we have it right now, because the only thing we are missing is Shift for range selection)

Pen tool:

• While adding a path point, if Shift key is pressed, move it in 45º increments
• Ctrl+click a path point to convert between straight corner and bezier.
• Ctrl+drag a path point to convert it into a bezier (make sure to start a curve with no loops always)
• Ctrl+drag a path segment to create a curve
• Ctrl+click a bezier control point to remove it and make that side a straight edge
• Alt+click to select a point (Alt+Shift to extend selection), then selected points can be moved as if Direct Selection tool was selected