1 I don’t know.
2. Nouns defined with /XXX/ automatically work with get and drop. They don’t have to have individual actions for these verbs defined but instead use a generic get/drop routine. If you want something special to happen when you get or drop the noun you need to write a unique action for that.
3. I’m not sure, but in some games there’s a “limbo”. When you die that you can return to the game from here (Adventureland have it, for example). I have a vague recollection that this “limbo” is room 0.
Earlier this year (spring and early summer) there was some discussion about the SA-format in a couple of threads that, if you not already read them, you could find interesting.
For example:
ScottKit:
https://intfiction.org/t/scottkit-compile-decompile-scott-adams-game-files/
https://intfiction.org/t/scottkit-producing-misplaced-out-of-order-strings/
https://intfiction.org/t/adams-randomly-picking-one-and-only-one-of-a-group/
PerlScott:
https://intfiction.org/t/new-scott-adams-format-interpreter-perlscott/
Scott2zil:
https://intfiction.org/t/scott2zil-a-tool-for-converting-sa-games-to-zil