hmm I think that would be confusing.. if the bar stuck to the bottom of the page then stuck to the bottom of the post once you reach the end of the post (old position). Might just be me :)
I totally agree on customization! I think that would be awesome!
I saw many websites did that. It would be fixed on bottom for whole post except when the user reaches end of post it will stick there just in case. Similar to hidden, but actually more realistic.
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