To expand on Privateer's post, you can get a slightly hackish way of drying berries by copypasting that snippet to the cookery_glossary.txt file, for example into the vegetable recipies section, before the [SUBMENU_END:vegetable] tag. I say "slightly hackish" because as far as I can tell, the salting/smoking/drying methods are hardcoded and you can't expand on them - so it has to be made into a recipe, which is a bit counterintuitive and doesn't really work like drying berries or mushrooms would in real life (the cooking recipe methods need you to have a fire, but in reality you can dry berries or mushrooms the same way you can dry meat or fish in the game - it just wouldn't take as long). It would be nice if the salting/smoking/drying methods could work with wider selection of foodstuffs, but I doubt the devs would consider it a high priority since the recipe mod can be used to create almost the same effect.
EDIT: Never mind, I wasn't thinking properly... Anyway, I noticed that the devs are planning to add berries and mushrooms to the foodstuffs that can be dried - so maybe next version will have that?