I just realized RR:RA has a form of RoR, which works similarly to what SW has.
Check the joined pic, it's from E1L7 the (awesome) Refinery map.
I had a look at it in mapster and this is actually 2 rooms, one above and one below. The hole is a viewportal and there are a bunch of tags that connect both. Just like SW.
Weird how it's barely used in the game at all! And when we think RoR, we think SW or Blood, not RR:RA ! Underrated game I tell you.
Edit : found other uses of RoR in the game, in E2L4 and E2L7 but it's small, just for a hole with a ladder (I suspect there may be more of those where you can find ladders in the game); and a bigger more interesting one for the whole roof of the brother in E2L6.
I really wonder how good this RoR is compared to SW's. SW's is very wonky and also laggy.
BTW looking at all these maps in mapster is absolutely sick and shows how smalltime we all are regarding Build compared to Xatrix's level designers... Some of these maps are crazy, a lot of them pretty much reach the ressource limit and are full of SoS and other crazy Build tricks.
Edit 2: pic of the brothel RoR too, the whole upper part starting from the first balcony is RoR. I can't believe I didn't notice anything before, although I did wonder how they made that effect in the Refinery map.
Between RoR that works just the same, slot machines and driveable vehicules (although very different), it looks like RR:RA was very influenced by SW.