Lots of good ideas there - personally I'd like to see a flat reward curve, and no time limit on voting so we can vote for posts older than a week - what I'm doing now (on my other account that has more voting power) is upvoting an authors recent comment 100% as payment for an old post because I can't be arsed tipping.
And 5% burn to get unstake instantly is great. I also think power down should be shorter - two months rather than three.
Thanks for all your inspirational posts.