Keyboard alternate for clicking Magic Trackpad?

Using LiquidText, I can draw with the Magic TrackPad by pushing to click and then drawing while the click is held.

Is it possible to change this so that Ctrl or Shift or some other keystroke replaces the click on the Magic TrackPad? It would be a lot easier to draw/write if I did not need to keep pressure for the click with the same finger.

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