My only suggestion onto this is just adding on to what has already been said. But instead of upgrading the sell feature, you could add in a sell all option in the ore tab, or for each individual ore.
Only thing I could input is, I'm not sure if it's a game issue or an issue on my side, flash played keeps crashing on certain load screens. ie Material Girl 4, Announcing the Tournament. Only two I can remember off the top of my head, will post if I find more.
 "Clicker Heroes"){kind=icon}
 "GatherX"){kind=icon}
 "Valthirian Arc 2"){kind=icon}