Do you miss something on BrainKing.com and would you like to see it here? Post your request into this board! If there is a more specific board for the request, (i.e. game rule changes etc) then it should be posted and discussed on that specific board.
Please note that I am not too terribly concerned with ratings. To the strong and diligent, the ratings and rankings will eventually come..... However, and I hope you'll pardon this if it seems strident, but I find your proposal arbitrary, a bit goofy, seemingly very tedious to implement, complicated to understand for many players, and overall just generally not worth the while.
You twice imply (but don't actually state) that "rankings" should be based on what you term "adjusted BKR", and you'd penalize those who came to this site earlier, and reward those who came later, for doing nothing!!? Tough luck! More players come in over time, both this includes both strong and weak opponents, so who is to say that any given time frame was easier than another to achieve a high rating? Furthermore, inactivity does not serve as a justification for demoting a player's rating.
Ratings are never more than an inexact science at best anyway, and your system would exacerbate this inherent flaw. The remedy for those who are worried about raising their ratings is to improve their game.