Finally something to fix my various woes with vanilla farming! It was easily my favorite part of the release but all the broken/missing features felt like a tease.
If you're taking suggestions for the missing/incomplete features, a good use for papyrus might be paper-crafts. There's admittedly no evidence that the Egyptian plant was ever used for anything but writing, but the Chinese had been using rice-based paper for art for about as long as they'd had it. In terms of DF, you could probably get away with calling it a "cloth" made at the screwpress.
I haven't gotten to papyrus in my Giant Table of So Many Plants yet - I just finished the H's today. But, it's my understanding that papyrus isn't so much like paper as it is like basket material - that the papyrus was the writing surface, but for flexibility/hanging-together it was backed with actual cloth. So I'm not sure it would be appropriate for actual paper-making.
That does make me wonder about maybe introducing a couple different kinds of baskets, which could function as bags and large pots, and be made out of a custom material I'd give to woody plants and a few kinds of wood. It does seem odd not having any applications for papyrus or bamboo when they're such useful plants IRL.
It looks like almost no one wants the fictional plants completely removed, but there's about 2/3 support for restricting them to fewer biomes. Everyone wants to keep the good/evil/savage plants, as well as valley herb and kobold bulb; it's the boring food, drink & textile plants that are under consideration for restriction.
I'm just writing this down so I can put up a new poll
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Like I said, I just finished up the H section of my plant info table, which happens to include Hemp. That got me thinking about plant-based syndromes. I've put up another poll to collect your thoughts on this.
Something that's unfortunate about the reaction system is that, as far as I can tell, there's no way to change the outcomes of reactions based on the skill of the dwarf performing them. A legendary miller would be just as likely to screw up detoxifying cassava root as a dabbler, and when a toxin causes permanent motor nerve damage as cassava's does, it might not be fun to have that hanging over your head. On the other hand, though, it could take a lot of applications to stack up to the point of damage, so it wouldn't necessarily be a big problem unless cassava was a staple of the fortress's diet, or a vital dwarf happened to have a preference for the taste of the stuff. And that could be a kind of Fun in its own right.
As for US legality, I don't have a problem with dwarves using things that are illegal - it's not like it's illegal in the game world! - but I do feel a little uneasy about the idea. I'm not sure how comfortable I am with modding in illegal substances, since AFAIK Toady has never included them in the game. But then, it could be Fun to watch a warrior run into battle stoned off his gourd on Hemp Bud Biscuits. So idk.