Hi,
I am pretty sure that somebody has already given thought on this matter and has come up with some tweaks and maybe even playtested them a bit. The group with whom I usually play consists of 5 to 6 people and a 4 player game does not get too often into our choise of day (altough Doom being a very awesome game).
I personally have run only two games so far: one with the default difficulty and with 3 marines and one with the easiest rules and with 4 marines. The first one was too hard for marines and the second one too easy. So I guess for my group it would be somewhere in the middle.
What do YOU think of the following custom rules for 4 marines + 1 invader game:
- Multiply the amount of invaders in a discovered room by 1.25 when with 4 marines and by 1.4 when with 5 marines (apply common sense of course)
- Invader player draws each turn as many cards as there are marines as per default difficulty
- Starting health and armor of marines is as by the default difficulty
- Starting ammo is as by the default difficulty
- Marines get to have two marines skill cards as per default difficulty (maybe one card when playing with 5 marines)
- Found ammo is multiplied by 2 to cover more marines and the bigger amount of invaders
- Invader player gets to spawn twice per turn
- Invader players max hand size is 9 when 4 marines and 10 when 5 marines
- Invader player does not get frags by depleting his invader card deck as it would go through the dec too quickly
- Weapons dont break when just playing as a standalone scenario but will break when playing a campaign