1. Archviles cannot revive Spider Masterminds, Cyberdemons, or other Archviles.
2. E2M9 has a symmetrical room, other then that I don't know.
3. All of them.
4. I would know if I had mine with me :(
5. I think there is a map that requires you to shoot a switch with a hitscan weapon to exit it, I forgot which it was.
6. An energy cell only gives 40 cells so I'm sure a box of bullets (200 bullets I think) could do more damage.
8. Monsters can kill their own kind when damaged by a barrel destroyed by the other monster.
9. Pain Elemental?
10. Like the other question there are secrets that need hitscan weapons (or fist/chainsaw) required to open a door or whatever.
11. I don't think any of them are symmetrical to begin with?