So far, this is the only pull request I've received to fix this issue.
https://github.com/grokouser/yacoin/commit/34f795b1362b068e313d2f47ff3428aaf1a217df
Which is basically the same thing that sairon proposes.
https://github.com/grokouser/yacoin/commit/34f795b1362b068e313d2f47ff3428aaf1a217df
Which is basically the same thing that sairon proposes.
That's the original proposal. I think sairon has a newer one (in a pastebin he deleted) which mainly uses POW difficulty as trust and let POS block inherit the trust score from previous POW block.
Send a pull request for all of your recent changes when you have a moment. Block 400000 (!!!) is coming up soon so if anyone else wants to provide feedback or alternate solutions do it soon. If not, I'm going to merge sairon's changes - probably by the end of the weekend.