When you move your cursor above the bbcode-button "list=" this tooltip appears: "Ordered list: [list=]text[/list]". But this info does not explain the function correctly. It does not tell the user that they need to add "1" and "a" for the two types of ordered lists.

Example for a change of this tooltip:
Open: \language\en\posting.php
Change:

    'BBCODE_O_HELP'            => 'Ordered list: [list=]text[/list]',

To:

    'BBCODE_O_HELP'            => 'Ordered list: [list=1]text[/list] => 1. text or  [list=a]text[/list] => a. text',

or something similar to my example. Maybe without the "=> 1. text" segment or a bit more detailed. But don't overload the tooltip.