I would love to restrict players from spawning mini's until X seconds after a wipe. Would you consider adding this?

This feature is generally useful for a lot of plugins, so it probably wouldn't be worth the effort to implement this for one plugin at a time.

I'm not sure if there's a plugin that already does this exactly, but there are some for similar concepts. It might be possible to simply use a combination of them to achieve this, until someone implements a standalone plugin for this concept specifically.

One combination you could try would be to use Dynamic Config to update the config of Command Block at specific times to block the mymini command.

I totally understand. I'll look into those.