I don't know if I'm alone here, but having grown up playing electronic games and learning programming I have trouble at times creating games that are simple enough to run with paper and pen.
One common problem is run into is automation. or very basic artificial intelligence
I'm interested in cooperative games, and that requires some aspects of the game which work against the players to run automatically. Hoards of enemies for instance.
Ideally, I would have games with armies and characters who could be player controlled with larger numbers of players, but automated for smaller games.
What are mechanics you know of that can help govern automation? Anything other than a shuffled deck of cards?
I'd also be concerned with turn length. Does this cause the payers to have to consult a rulebook for 20 minutes after every turn to determine how the enemy moves?