I recently had a tree taken out in my yard, and the wood chipper got me thinking. What would happen if I macerated a log? Turns out, nothing. A macerator can handle stone, so I'm sure it could handle wood. So I simply suppose nobody's thought what to do with chopped up wood.
I'm sure more uses will eventually be found, but I've thought of one. Throw a log into a macerator, and you get a certain number of woodchips. Woodchips used to make plantballs will produce 4 plantballs per log's worth of chips, similar to how plantballs made from saplings make extra. (In my other thread, linked here, I detail how a plantball is worth 1/4 the energy of a charcoal, and thus a log.) If these plantballs are used as is, this exchanges 1 use of a furnace to make charcoal for 1 use of a macerator to make wood chips - roughly equivalent. But if these plantballs are further processed into biofuel, the energy yield is increased over charcoal, at the cost of the bio-fuel process.
Without this suggestion, there is no way to macerate wood or use it to make biofuel, though realistically it would make sense to be able to do both. Additionally, further uses for wood chips may be realized.
Side note: It is currently possible to generate three times more energy from wood via scaffolding than via charcoal. I recommend that the fuel value of scaffolding be changed to 250, the value for a stick, from 750, the value for other wooden items.