OK, I've had a look at the beta up to patch4. I like the graphics but am not able to use it as an editor.
Have you looked at the original editor, mapedit.exe, that came with Colonization version 3.0 and available at the historical site,
http://www.dledgard.freeserve.co.uk/col.htm ? It would be helpful in putting your program in perspective. The other editor, cedit.exe, available at the same site works on the game files (*.sav) and seems useful for scenario making.
I'd like to spur PH on to his strategy opus magnum - how about a start, PH?
We could start something in the Other Games forum. If you don't initiate something in a week, here's a threat to pip you to it, for starters anyway.