Cursor keys: move around (requires keyboard mode to be active)
Space: use current tool at cursor position
t: toggle column export tool
x/X: add/remove X offset tool
y/Y: add/remove Y offset tool
Need to save your progress and come back later?
Use the "Save/load current state" textarea (Scroll into view now). Press "Put current state into textarea", then press "Copy", then paste the output into a file on your computer. To load back saved data, open the file on your computer, select all and copy and paste everything into the "Save/load current state" textarea. Then press "Load state from textarea".