I hear you! I once suggested we get special slots for the different types of things we craft, like a couple of pet snack slots, a few treasure card slots, a gear slot, a housing slot, etc. You're right that there's plenty of room, and the higher your level the more you want to craft a lot of stuff all at once.
Ohh. I love that idea of crafting slots for different things. I have found myself more than once crafting furniture and filling my slots , completely forgetting that I needed to craft some pet snacks that day.
I try to remember now to do the transmutes first, then pet snacks, treasure cards, saving the gear and furniture for last.