Is it possible to have the chance to up-vote posts a second time, but only once one has scrolled down through a post after opening it?

If so, we can make it so that a single vote will distribute STEEM from the rewards pool (no matter from which upvote button the vote came from), but a second vote will determine post ranking within the second type of trending page (the "double votes", presumably quality posts).

Single votes, such as the types that come from bots, will still earn their curation rewards, but second votes would presumably only come from satisfied readers who took the time to click on the post, read it and then scroll to the bottom to cast a second vote.

Only the first of the votes would count on the block-chain, but the second vote would determine the second type of ranking on the Steemit front-end.