I've had an idea! Now, it could be a load of rubbish as i'm new to AH (only played twice so far) so I don't have the experience yet to know if this would be feasible or not. I was thinking of ways to make the Mythos threat escalate and slowly build over time. How about tieing the Mythos Phase into the number of Doom Tokens on the Doom Track? So in the first round there's 1 Doom Token so you draw a Mythos card if you roll a 1 (or 1-2) on the dice. When the Doom Track goes up to 2 you draw a card on a 1 or 2 etc. Probably on a roll of 1-2 with 1 Doom Token, 2-4 with 2 tokens would be better thinking about it or it could take forever!
Like I said, i've no idea if this would horribly unbalance the game. Just wanted to see what people thought.
I'm quite prepared to have my idea banished back to it's fitful slumber...