Hi I'm new to these forums so be nice please.
I've started a new campaign with a new group of players but we're a bit under-strength at only 3 Marines - Librarian, Tech-Marine and Devastator. I'm not a novice DW GM by any means and have ran it for several years now but normally had a party of 4 - 6. Given how tight it is covering the bases required for a fully immersive campaign with 4, I'm concerned that they're really going to struggle with just 3 and totally stall at something simple (particularly healing - given the lack of apothecary).
Consulting with others, including the players, has produced the option of me running an active GM PC. Specifically an apothecary to cover their main weakness.
Now I'm not entirely convinced by the idea. Obviously I've used NPCs in assistive roles but generally only for short periods and never for key parts of adventures. I'm worried that, given I know the ins and outs of the scenarios, it would occasionally seem a bit too much like GM ex Machina - especially as I'd be playing the Healer.
I'm also worried about the amount of keeping track I'd need to do as both GM and PC
What are other people's thoughts. Has anyone ever ran a game with a GM PC? How did it go for you?
BTW I dont run pure DW rules. I incorporated some BC elements to smooth out certain aspects and then incorporated some good old home brew rules (such as incremental power armour damage) to give it a much more gradually increasing threat aspect without going from "Walk in the park" to "OMG we're all dead" in an instant. Which kinda ramps up the need for an apothecary.