You could possibly have different modifiers depending on the type of wood, as well.
Or do you mean... Tower cap wood [VALUE:2], Feather tree wood [VALUE:1], as an extra modifier even, apart from flavour?
Hehe. Why not. Then some dwarves will have expensive tastes.
Yeah, sorry, that's what I meant. It would be a way of differentiating the different types of wood, so there would be an incentive to trade for or harvest certain woods best used for barrels (like, say, maple or apple wood - I don't know which woods are usually used). Just so if you want to get super-high value liquor, you can try and grow high-value plants and age them in high-value barrels. It'd be yet another mini-challenge.
Alternatively, if you wanted to complicate things, you could have different liquors age better in different wood-types.
Personally, I always end up with far too much liquor (in DF, not real life), so I wouldn't worry about some of it, at least, end up getting aged. I think, though, that eventually preferences will be rehauled, so if a dwarf has a preference for a certain food (or drink, in this case), they might select it over another food-item, even if that one is closer. Then perhaps you could have nobles preferring the longer aged, higher quality stuff. Or even reserving it for themselves, breaking the knees of the peasant that drank the last of the premium 12 year Sunshine. But that's all pretty far down the line, methinks.