Hi there,
i think it would be an improvement, if you could have some interface, where you can place the items, what you want to upgrade.
I've got for example Express Belt and at the beginning its still quite expensive and you don't want to spend it everywhere, when you don't need it or am i wrong? Or like Assembling Machines 3 or something else...
I'd like, if you could do something like that, throu i understand, if you don't want to make it...
Regards Jonathan