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.

PickList was indeed borked for World object lists, this will be fixed next patch = )