Sav
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That's exactly what I did; it generated according to the template, which is the default one. For example, I had 8xm8a, and that's what I got. The only thing is that the castles are generated in a fixed way, so you'll have to remove them and place random ones in the editor yourself, so you can choose.
It should generate according to the template from rmg.txt in the Data folder; if it's not there, it will randomly choose from the standard ones.