It could, but I'm not inclined to because:
a) it's something relatively few people need; and
b) having too many 'Sticky' threads would detract from user's ability to use a given forum. In this regard, I note we already have 6 'Sticky' threads at the top of the Word forum and 4 'Sticky' threads at the top of the VBA forum.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]