Fly Eagles Fly!
The Cthulhu player, not the Football player.
Question #1. When the window opens for actions to be played, if it isn't your turn can you still play actions....in other words, if its my turn and I draw my cards and don't want to resolve an actions can my opponent still have the opportunity to do so?
Yes, the defending player (non-active) always has the oppurtunity to play actions during any action window even if the active player chooses not to. The active player always gets first chance (even with responses) but you still can if they pass.
I have Assistant to Herbert West and Contract Killer and another character in play. My opponent plays The Time Is Nigh, after he brings out Cthulhu I use the contract killers ability (his action was the ritual so it would be my turn to play actions) then I disrupt the CK action to sac a character for Herbert West.
That would be fine, except that character you sac cannot be CK. If you sac CK to pay for Dr. West, then you can no longer pay for CK's ability and thus it fails. Make sense?