Add/remove items from crafting queue

Select the - or + to craft/create multiple items can take forever, especially if you’re trying to move things around for resources or just move training heroes around to change one from extra low cost to backpacks (for example). I think it would be nice to have a popup allowing you to physically add a number to add/remove from the queue. If I wanted to make 9832942374 minor mana potions, I could do it quickly vs having to hold the + button for days.