Gonna hijack this post to say that using items in bulk would be a really nice feature to add, especially as you get into longer runs and you have tens, if not hundreds of items. Personally, I'd like to have a way to use a percentage of items (say, 25%, 50%, 75% and 100%), as well as being able to set a specific amount of items to use.
I'm sure this is being worked on, but I'd also like it if there were more efficient ways to get juiced for longer runs, maybe the character can make a more powerful juicer that takes more power to run if they're smart enough?