I recently filled the blast furnace with 200 coal and couldnt add the secondary ore because I was at the cap, seeing as there isn't a way to add more and no way to remove ore I ended up just having to log out and lose my ore.
Totally get what you mean, as I have seen some other players having this issue before. The ability to remove ores should make sense, no question. I would suggest following the format below for your game suggestion, but other than that, I support. :)
I got many PMs regarding this issue when I was a staff member and unfortunately logging out and losing your ores is the only option atm. Hopefully this will be fixed in the next update.