That is not a Gaming question, for starters. At Gaming, we don't handle mod development and map development. Gaming and Game Dev had an early discussion that marked them the subject of Game Dev, not Gaming. And, to wit, haha, you started that discussion.
As mentioned by ChrisF in the comments, if you want a migration path, you need to provide ample amounts of evidence. Questions that have been migrated to Gaming, for example, or ones that should be migrated to us. Ample means a fair amount - you need to prove that people are coming here with the wrong questions, not simply that they might.
At present, 0 questions have been migrated to Gaming from this site. Comparatively, we have sent 7 questions over here. Gaming doesn't have an opened path, either, because 7 is a pretty piddling number.
Until you actually become inundated with Gaming questions, the migration path is unnecessary. A moderator flag should be sufficient to migrate them when appropriate.