Perhaps I'm stupid, but I don't understand what you're problem is exactly. I've never experienced a pop-up related to /list, unless you mean the "List Options" when you right click it...
If you right click the list, and then click on 'List Options' and then uncheck the box 'Hide non-text channels' then you should get channels that begin with non-alphabetical characters such as !, &, \, / etc.
If this doesn't solve the problem, please give more detail on it

Happy chatting.
Regards,