See?
they should act like noparse tags too, don't they?

seems like more tags are parsed - maybe only not smileys are parsed?

That's wrong then, becuase the whole point in the [code] is to display something without worry of it getting parsed by the forums, Hence why you put in [code] rather than a simple [quote] bit.

Yep, seems like it. I was kinda used to using [code]-tags for tag-description purposes on other forums. Maybe add a noparse-tag-button next to the php-tag-button?