I think Koen would say is that one of the first things to do is to learn GEF. Second thing
would be to get to know the source a little by playing with it.
I tried the latter once without learning GEF since I only wanted to see how difficult it
would be to change some small things and that was fairly easy. If you want to change the
drawing capabilities (like e.g. snap to grid for the transitions, please...please... ;-))
then GEF is certainly needed
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