How to prioritize Fabrication over all else?

How can I prioritize work at the Fabrication bench when I have one main crafter?

They seem to prioritize working at the drug bench, so I added a skill cap to prevent skilled workers from making drugs, but he just moved onto the smelter, which has no such capping ability because it's unskilled labor.

The only way I can think of is to assign specific jobs to individual people, but then I lose some flexibility of being able to take advantage of colonist's down time.

Is there a way to prioritize one crafting job over another? Having to constantly select them and say "Prioritize work on Fabrication Bench" is a pain.