How to manually placing auxiliary ship buy orders

[ISSProxima]

I'm using Terran building method,so my auxiliary ships requires ECs and those three terran materials to resupply missile, they will get them automaticly by placing buy orders, but the problem is:
They buy ridiculous amount of ECs and very little other materials, which makes the resupply of missiles really inconvenient, since I had to manually control several of my freighters to get those other three materials for my auxiliary ships.
Is there a way to manually set how many of each materials I require for my auxiliary ships, just like how station works ?

[Wargear]

I think another good option would be to put carrier and auxiliary ship supplies in the list of consumables to buy at a shipyard making resupply easier and the option to have a fully stocked ship at build time as well.