That's an interesting idea... but I have no idea if it's doable programmatically?
My idea, as you've now discovered, is considerably simpler and usable immediately. Just takes an intentional act on the part of the visitor. ;)
Thanks for looking it up! :D
Alternatively, you can also comment on the post but upvote another recent post or comment that is still within the payout window.
Absolutely!
No (observed) good post should go unrewarded! ;)