well, after using it some more, a couple more things

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Every time I edit something of the map, the editor asks you to save once you move to a next tile, or exit or something like that, which is good, but it KEEPS doing that, so, for example, when I edit URBAN01, and then move to URBAN02 the editor asks me to save. Then I edit nothing of URBAN02 and move to URBAN03, but the editor again asks me to save 'because the map file has been modified'. This happens all the time now, and best is to exit and restart the program

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Also, but this might be something I'm missing, is there anyway to 'clear' a map, so it contains nothing? Or to select an area and edit that entire part? (in the topview I mean, when editing tiles). Would make things easier
Lastly, the alien routes seem to behave quite different once ingame, but it's quite complex and I'm not entirely sure of what I'm doing, that might have something to do with it