I have the same issue (I think): I want the TOC but do not want the Contents button on the toolbar. (It does not do anything useful.)
The problem is that if I uncheck the contents button on the single source layout, though I do not get the button (good) I also do not get the TOC displayed (not good!)
There is one way I can fathom having your TOC with no actual Button showing.
What you would do is to edit the skin and use perhaps a super tiny (as in 1px X 1px) transparent image for the TOC. Remove any text. The net result would be that the TOC would still technically "show", but would be essentially invisible.
While that should certainly accomplish the stated goal, I might think it would sort of "trap" your users and provide no way back to the TOC if they were to click the other buttons.
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Thanks - works a treat.
I don't need a contents button because we always show it (don't have an index etc)