great idea! but can come in addition, not instead, because some people want to move between their own wallets from time to time.
we can set that when the final coins will be ready, addresses that hold the tokens, will get more coins, according to the so-called "coin days".
the numbers are obvious: we'll do it relatively to the 15% discount.
so, another way to get the 15% discount, is simply not to move your tokens from the 1st of march which is about two weeks from now (this doesn't hold for tokens held on bittrex). i'll write it publicly somewhere.