Its been a while since I had a look at your mod. While reading through the files, I found this:
NOTE: For technical reasons, a dwarf that has transformed as part of the ritual tree's ceremony reactions will be unable to successfully assemble a spider construct. Bear this in mind,
and use your manager screen to make sure you're not wasting any efforts!
This can actually be fixed by using the TrueTransformation plugin. I think you know this, so maybe I am just alerting you to an outdated manual entry...
EDIT: Found another one:
Hostile races will not fight amongst each other (except for goblins) outside of legends mode. This is currently impossible for me to fix given the current engine.
Can be done by interactions, for example one race can turn another race opposed_to_life to force an engagement, or by using completely different ethics in their entity files. You have quite a high chance for a war between the civs then. They will fight each other if they meet near your fort. It also makes balancing worldgens harder, because they wipe each other out more easily.
EDIT2: And the ether entry putnam was talking about:
NOTES: Ether was supposed to cause a syndrome upon contact with certain creatures, but this idea had to be scrapped due to technical difficulties. The remnants of this code have not been removed from the raws, but should not affect anything.
Can indeed be done now with itemsyndrome or spatter_add, if you want to make ether-coated weapons.
EDIT3: Greater ritual of sustenance claims to take live vermin as a reagent... at least in the manual. The reaction raws takes ash, among other things, but no vermin. Were you unable to use live vermin as a reagent?
EDIT4: And a last one: I remember there being a problem with civ-member and the mischivious tag. Was that ever solved, does your mystery caste work know? If you cant answer here about it, you can send me a PM, to avoid spoilering people.
EDIT5: Silly me forgot one thing... putnams moddable gods.
You can add your invented pantheon of Visthel and all the other gods as actual deities into the mod.