Two words: Flax Bread.
No special stats, maybe a little boost over the normal bread, and obviously no hurt pts like bark bread. Maybe a little bit of constitution points, because it's... ya know, good fur ya ind shtuff.
Also: a powder that increases the quality drinks. Flax can be mixed into drinks in rl, maybe a powder that runs ((drink + Flax_powder) /2) or something like that. Bad flax powder lowers drink quality. This would definitely put a good use for flax seeds.
Maybe the powder or bread could restore HHP, what with it being good for you. I'm not gonna gripe over the hhp damage never healing, because there are plenty of Mouflon around my settlement, and enough clovers to choke an auroch. It would just be a good use for flax, and you wouldn't have to look silly with a bandage on your head. I mean, it's bad enough that you got anally molestered by a boar.
All i know is that i've got an inventory full of flax seeds, and while that's not bad, my whole inventory is seed bags. I've got full nature, so 3 seeds per crop. I can only plant so much grass before my mind disintegrates, and dropping the stuff on the ground counts as litter, which from what i've found out, makes the dude VERY unhappy. (In the range of 0 to -100 depending on how much crap you drop) This could be a problem later when happiness and unhappiness play a larger part.
Recap: More use for flax, i'm inundated with 'em.