Well, since the nodes get locked for editing while an editor does changes to it, it shouldn't be a big deal to use the same locking mechanism during a frontpaging and vice versa.

That is, as soon as the frontpage button is clicked, lock it for editing, and if the author is on an editing page, disable frontpaging (with a notification of why, so the would-be frontpager takes an extra look before committing fp on the nex text).

There might of course be some timing issues still where both hit the submit buttons at the same time, but it can either be secured by double-checking the lock, or ignored as a very minor risk. Up to the implementor, really. :)

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You have moved into a dark place.
It is pitch black. You are likely to be eaten by a grue.