So from what I can tell, this is an addon / editor gui addition to GameMakerStudio?If you manage to integrate an easy way to add busts for dialogue, it's probable I'll use this for PFC.
http://perseverancefullclearance.blogspot.com.au/
It's a GMS source file, so anything you see in the demo can be tweaked just by editing the code. The dialogue system basically just uses an array for text, shouldn't be too much work to add in another array for mugshots/busts to go with it.
Thanks for the info! Once I consider working seriously on PFC again I'll definitely grab this up.