An eager newcomer who wants to learn...

[palistov]

Just add multiple instances of the code. If you want to have two keys open two doors, use the same script twice, with the appropriate entities matched up.

As to #3, it's in the reference thread. CTRL + F and look for 'faint' and it should take you to the mini-tutorial. Click the link to see a list of relevant functions I posted on a thread asking a similar question.

#1 is also there too, but on a different thread which the reference thread I posted leads to. Search for 'cool thing' and you should find the link. Click that and look for 'scary/spooky ambience' or something like that. That should give you a script structure to use for random ambience.