Just dropping a line, I might be misinformed but I do remember devs mentioning the possibility of "batch crafting" in 2.0.
Given, just speculation but- If they do add a way in which you can throw a lot of raw materials to synth a lot of worked materials at once with a single synth sequence (like an extended version of how, say, 2 cotton bolls gives 1 cotton thread and 6 cotton bolls gives 3 cotton threads) it would probably be exactly what the OP is truly asking for. It also most likely, for all accounts and purposes, would count as a single synth.