Hello. I have two questions about Belzebub mod too.

1. Does Scroll of Resurrect have any use in Belzebub? Normally, this was a multiplayer-only item in vanilla Diablo, and the mod is single-player only (although there is a multiplayer version called Tchernobog), It seems useless to me, and I'm always selling all the scrolls.

2. Does Sir Gorash appear? As far as I know, this unique monster is always present in Diablo's lair in vanilla, but Belzebub has few (I think three) new bosses there.

you answered #1 yourself ;)
as for #2, I think sir gorash is still around