Lots of people would love it if tiny coal and charcoal could be used in the compacting drawers

Can you give me the resource locations of those items?

Rather a late response, but they are tinycoal:tinycoal and tinycoal:tinycharcoal, crafting to/from their vanilla counterparts in an 8:1 ratio.

However, for more comprehensive compatibility with mods sich as Tiny Coal, it may be better to allow the drawers to handle all single-ingredient recipes, both shaped and shapeless, rather than just 4:1 and 9:1 (which, at least from my experience playing with the mod, seem to be the only ones picked up). I admittedly have no idea of the technical feasibility of such a solution, however.

Alternatively, adding config-based functionality for custom compacting recipes would enable mod pack makers/server admins/SP users to add their own compatibilities on an ad-hoc basis (similar to how Storage Drawers handles it).