I've had a lot of people comment on this from both sides. DIY allows creators to lock people from editing a microgame. Effectively, its just a byte that says "Hey, I'm locked" and can just be ignored by CrygorTool. Mioedit does not allow editing of locked games, but as far as I can tell, this is only by choice of its creator.
Here's the problem. I might make CrygorTool's source available to edit (it's made in GameMaker 8, for those wondering. Not the best choice, but it is fast to work with and familiar to me, and there's no messing with .NET libraries or anything). If I release the source, it won't matter if I decide to not allow edited locked games, because someone can just edit the source to remove the check.
Ultimately, I think I will allow editing locked games, but I'll add a sort of guilt trip "Don't be a theif!" warning message. I'd like to hear your thoughts on this.
Edit - Poll added on the right.
Edit 2 - I have turned on anonymous posting, but I'll turn it off if there is a lot of spam.