The shadow button is another one that is useless.
There are a few SMF features that are missing from this, actually... most of the reasons that anything is disabled is for security purposes.
Can you give an example of the text allign thing too? I think the BBCode interpreter is either very complex or so few lines it'd be hard to set such constraints but I could be wrong.
[(anything)][right]{text} will not apply the left tag to inner text.
Input: [b][left]text[/left][/b]
Output:
text
[/b]