I love the idea for the world pool and items that move back and forth and seeing teh results of your shinanigans (I'd love to see ending credits in all games like are in final epps of the seasons) I'd also like to see items that are picke dup in epp1 and are seemingly useless (and possibly loosable, though not destroyable) and are REQUIRED in eppisode 6 (I hate hte idea of a game becoming unwinnable, but it woudl be fun to say, you have X inventory slots, but every shelf (for example) that you can find you can leave Y items on (and these items not be seeable unles you click the shelf) this way players will beforced to keep up with their items better
Having done some (EXTREMELY) minor 3d work and code myself, I can tell you that having a moveable camera (except perhaps side-to-side or zoom) would atleast double the time for artists and animators, if not increase it 3 or 4 times every flat ofject suddenly has to be 3D (2/3 of those items ont he stree, for example, I bet are flat ofjects with a fake 3D look) If this were done the games woudl be at the rate of 1 every 6 months not 1 a month (though for a puzzle or two, or a room or two this woudl be very interesting and be quite an oppertunity for both jokes ("See Sam, I told you nobody was looking over you sholdier watching us") and for puzzles ("Hey, there's a button on the back side, little buddy!")
Though a zoom-in/zoom-out would be nice, I hate playing 'hunt the pixel' when sam ends up standing infront of a vital item/place/person and you can hardly get to it/them
As much as I find time annoying in games, it could add interesting options, such as perhaps certain characters like the "fae vampire" (cant remember his name) only being avalible at night, and during the say he's sealed in his coffin (also meaning at night you might sneak in and rifle through his coffin) While I think an hourly schedual woudl be way too inconveniant (anyone who played the older Zelda game "majora's mask" can attest to the "hourly" method being a major pain in the backside) Day/night could provide fun puzzles and make the game a little trickier (such as having to kill time untill dawn/dusk)
Just my feelings on your thoughts.