Yes. It would also be handy to be able to cap capacity for individual ores below their physical cap and decide what MPU should do with individual resources when hitting capacity.
#Ability to discard certain resources from main processed storage
crude matrix
quick locust
I was dealing with it a bit different. I vomited out the iron ore. Since iron takes about the longest to process, you can spit out most of the ofending ore after the rest is processed.
crude matrix
Yeah, but it would be nice if you could tell MPU
If hitting capacity for specific ore:
a) leave unprocessed (but possibly baked dry of) nugget in hold
b) discard as dust
And also to tell processed storage to
set the cap for specific ore to x%
For example you could set it to small buffer and discard so you could still eat 
to replenish drones/kinetics, but not weigh yourself down, and stop processing for 
to not shit out money if you overeat.
Why?
waggles RCS aggressively
Hey, k225 at least has a lot of space in its hold (though it's mostly long and thin).
Try k37.
crude matrix
Yeah, but that is really for when you no longer have enough processed storage. Filling k225 to brim with one valuable ore while still processing another is not all that common.
copper vector
*waggles RCS aggressively*
It'll still clog quite fast
high atlas
rusatom would be the only mpu that wouldn't be able to it
it's essentially a giant heater,you can't stop it from processing certain ore without turning it off completely
unless it has a really high melting point i guess,then you can lower the temperature
all other MPUs can just turn off when they detect undesired ore inside
actually,melting points would be a nice mechanic for the rusatom
you could set it to really low power so that it just boils off the water
assuming resource nuggets are lumps of metal surrounded by ice and not metal dust mixed with ice