This should be a pretty easy feature to add and it would be a great help in the setup for auto-stack. The relevant window shows how many stacks there will be, but it does not currently say what the sizes of those stacks will be. A line listing all of the stack sizes, e.g.
Stack sizes: 1, 3, 5
might tell a user that the setting is right whereas a line showing:
Stack sizes: 3, 26
would probably suggest shrinking down the interval a bit.