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chaot - BBCodeExtra has flyout submenus viz:
I think that
BBCode button you see in Text Formatting Toolbar allows you to switch between BBCode, HTML... and Wiki maybe. I prefer not to install this extension as I would never use it, I use the context menu via the menu key almost exclusively. Why don't you install Firefox as an alternate browser?
BTW: BBCodeExtras also has XHTML and Markdown flyout submenus available, but I suppress them via its settings.
One of the problems with changing existing toolbars (on anything) is that some people 'know' the button they want by its position (e.g. its the 5th button in the second row) or its juxtaposition (e.g. its the one to the right of the smiley button).
One idle thought I had was to give the smileys panel a tabbed interface - Smileys and More Buttons
On a couple of phpBB boards I frequent, the bbcode for strikeout is [s]...[/s]
BR