Once you start using beacons it can't keep up with supplying machines.
Py mods, can you empty the machine's burn result slot, too?
There's a problem with recipes with multiple products. There's no easy way to overflow a byproduct. For example, a vanilla's kovarex - it stops once you have you dark green uranium storage maxed. How about a way to select main product in machine's window?
I would like to see a startup option - default item storage count in stacks. I believe it's one stack while playing with mods.
An idea regarding icons at top - how about showing only icons with storage less than x stacks and an option to blacklist an item completely?