Jabier

..much better and intuitive
but we need some keyboard keys to control the direction of the curve right after we make a new node (as when you want to create a sharp corner for your shape).

on my vision - 3 keyboard controls we will need to use when we define the shape using the mouse movement

- a key for switching the node type
- a key to reverse the direction of the curve (when we move the cursor)
- a key to change the line type ( line / curve ) - from the last created node to the next "node to be created" ..

then - probably the final step will be an icon for spiro tool on the main  tool-bar.

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Nemes Ioan Sorin