Unraveling Secrets (Spoilers!!)

[Shurimoo]

In no particular order:
Has anyone found multiple uses for rope? The only one I'm aware of is a room in the middle-east of the map which uses a rope to extend an existing one for exploring a hole in the ground. It houses one of the orbs needed for the Astral Collider. I've found up to 3 or 4 ropes in a run and I'm curious if these are just extras or if there's actually more uses for them.

Is there anything possible with the mineshaft/elevator?

Is there anything else to the "wine cellar" room? (Arrived at via an explorable grate). That is, anything more than it just being a bit of loot? It feels like there should be something else there to me, for some reason, but I've been unable to get any secret doors or the like.

The Altar of Sool only has one incantation, right?

How many explorable grate locations is everyone aware of? I know of 5 possible rooms (I'm currently planning on testing a bit more but I think the grates themselves are semi-random since I found them in different locations than I recall last run but I might have just recorded poorly).
Grate Travel Locations I know of:
Sool altar (Spider Den)

Orb (Hallway and door. Hallway to left with door leading only to abyss; Door straight ahead has a spider and egg hole that spawns 2 more. Orb is in the room with spider to the left. Never open the left door, Niss can crawl up when you go to clear the spider door)

Prison (Is the "must be investigated" lever just because it opens something off-screen? I've never found anything of particular note in the opened prison cell). Has the mechanism piece for the warrior statue which is probably the most valuable artifact in the game.

Alchemy Lab (Rest site)

Wine Cellar / Kitchen (Kitchen is cut in half by abyss, cellar I believe is a safe rest site iirc)
I think there's actually one I'm forgetting right now so maybe I know 6 but it's late and I'm not gonna bother wandering around the map I have rn. Reminder to myself to try sleeping in an unsafe bed and see if anything happens because I think I've killed everything on the map lol and I wonder if it will spawn something or not.

Any successful activations of the Heavy Bell? I tried turning it on only after activating the Astral Collider with no luck. Also tried a Staggering Bolt from crossbow impacting its side to no effect. I wanted to try swinging my warhammer at it (as blacksmith) but didn't want to end up stepping too far and falling down it to my death (and figured it would have no effect anyway).

How about the Ghost Lantern? Nothing came up from using it in either the Astral Collider room (activated) nor the Warrior Statue room (activated). I think I flickered it in the Prison and didn't spot anything. Maybe next run I'll try it out at the Altar of Sool since there's that dead body there and idk it's related to gods. Actually, typing this out made me think: maybe the morroch dens? I mean I'm sure plenty of people have died in those spots..

Has anyone found the crank arm required for the vat multiple times and are they able to spot any pattern in its spawn location? I'm curious if it's entirely random or if it trends to a certain part of the map since it's a pretty useful thing to have available. I'll mention the one time I found it was in the secret room accessed from the north-east corner of the large eastern room (the one with all the shelves in the middle. 3 Spiders chillin in it, it has a rest site door on the southwest corner and symmetric entrance paths on the west side north/south corners).