I've been thinking for a while about which portions of the game and the expansions really need to be separated out. This stems from a thought that we had during a game. We don't have to be using the whole Lurker expansion in order to use the relationship cards. We could use the personal mission cards without any additional game boards at all. So I've spread everything out all over the living room floor (hopefully not for too long so as to not annoy my wife too much) to try and determine which bits to keep separate and which bits to keep together. I'm trying to figure out whether this will work without breaking the game by making it too easy, too hard, having contradicting cards, etc. If you've tried to do this before I would very much like to know your experiences. I'll list the things below that I would like to keep together. Feel free to comment, debunk, recommend, etc.
I've done some forum searching for info on this, and I found some info on doing this with some card types, but nothing too extensive on the subject. I apologize if I have missed something.
GOOs - I would like to keep all of them in one pile so that no matter what boards we are using we could potentially face any of the GOOs. One potential problem I have considered with this is for things like Atlach-Nacha's stipulation regarding Leng Spiders. The Leng Spiders would have to be in the cup for that game as well. However, if the next category below works out this won't be a problem. My point though is that if all of them are together, they may require that other things be combined as well.
Monsters - I want to throw all of the monsters into a single cup (excepting spawn, masks, and the dunwich horror of course) for all games. I think that this would allow us more variety in the monsters we encounter. The forum post that I found on this one though suggests that this will make the game much harder because the monsters from the expansions are mostly tougher. How much tougher? Does it make the game impossible to win?
Investigators - Same thing here as with the GOOs. I want to be able to pick from any of the investigators no matter what expansions I am using. Unfortunately I forsee the same kind of problem as well, where some investigators start with items that are only in their particular expansion's set of item cards.
Common Items, Skills, Spells - It seems like I could just keep all of these cards from all of the expansions together, and use them all for any type of game. Does this pose any problems?