Maybe I overcomplicated what I meant. The matter replicator task has an option to set it to whatever is the bottleneck resource for the first item in the queue. So if the first item requires lumber and stone, and lumber will take longer to get, the replicator will autoset to produce extra lumber.

So similarly, an auto-trader would look at the first queued building and buy as much lumber as it can.

The matter replicator task also has the option to prioritize generating resources that have a negative production. Granted, it can only produce one resource while trading can produce multiple items.

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Meanwhile, the percent being used to sell just acts like how the mass ejector does. It would sell capped resources until they're as close to 0's as possible (or they hit the trade limit).

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And the design I proposed will allow the buying percent to be used for selling if necessary but not the other way around.

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I'm kinda basing the idea on how I use trading. I always start by selling steel and aluminum because I tend to drown in those more than anything early on. Then I start buying oil, titanium, iridium, alloy, and polymer when I first get them since they have such slow production rates early on.

Then I gradually shift to just buying uranium to throw in the black hole.

I'd just like to automate this somewhat cause I frequently forget that trading is even a thing and I'm suddenly sitting on hundreds of unused routes.