It could be nice if you could set a daily spending limit for AI credit usage.
If you're doing some research you might end up making a lot of expensive questions and can easily lose track of your spending. Setting a daily spending limit would alert you to excessive usage, and you can adjust your usage accordingly.
You'd not have to worry about using up all your credits within a few days, and can focus on writing your instructions, and possibly dare to do more expensive queries more often.