So, when you make a NPC, and you have a thousand holds in your Editor, is hard to find the test hold with it. What about exporting the code of the NPC and also his custom graphics to a file? That would be very very useful to manage all the scripts you have and it will make exchanging scripts very very easier. Obiously you could import the script in addition to a NPC's current script, or totally replace it. Also, in your editor, there will be another tab, where you can import not temporanely whatever NPC script you want and use it in your holds. Like I said before, the custom image and portrait or whatever that's custom will be exported/imported with the NPC.
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