So I added 

CopyMightyScript command, which copy the current MS state into it's own pastebin, with an optional file path argument, if it exists will try to save MS into the file

ImportMightyScript command, it will use a file path if provided, otherwise the pastebin. This will nuke the current MS /!\ and replace it with the copied one. Obviously any world reference will be all over the place. Invalid ones will be removed but overlapping IDs will remain, but invalid. (Like I copied a script, it was waiting KO on a unit, I imported it in another map, and the KO ended up listening to an impenetrable wall :D)

So you still can share scripts, it's just not as nice as on the workshop ^^'

I have a workaround but it got limitations. 

I can provide a debug console copy/import functionality. (Debug console allow me to bypass the UI as it's a real time sink)

However the import of mightyscript would override any current setup, meaning it would need to be done as first thing on a map. 

Merging two mighty script would be a real challenge, and I'm on limited time ^^'

So I fixed the import / edit map coming with broken scripts.

However I could not replicate with the steps above the map override issue :^(

I appreciate how frustrating it must be and I apologize for that, however I will need replication steps to be able to pinpoint the exact issue. If I get time I might hunt how to replicate but until then if anyone have a reliable way to produce this, I'm all hear.