I usually Save As Normal Mission, but Scripted should work also, since the TMO layer of Jap_Minefields.mis is all "red", scripted assets. Lurker does the same with RSRDC... Don't forget that you have to set the "Mission - Parameters - Ignore player sub" - and don't forget to delete the tsr file when you are finished, not that it matters that much anyway... Another thing about the sub nets is that you can set them deeper in some spots so that ships can go over them... but you do have to go kind of deep with them for the Yamato Class to clear, and you do need waypoints for that...
