The mass-edit wizard should have an option for changing the default region of combined games

[SomeoneSlimy]

I wanted to import some complete romsets I have on an external drive, then mass-hide games that weren't released in the USA to make the library less cluttered, but still have them easily playable by just unhiding them. This doesn't work however, because with merged games I don't seem to have any control over what region becomes the default one when importing, and afterward I can only change it individually.