I'm currently considering either a time or difficulty based solution
Time based: X coins generated per hour. Coins are effectively distributed by the percentage of hash power you contribute to the network. Subsidy reduction not necessary.
Difficulty based: Amount of coins generated scales relative to difficulty. Amount of coins generated per MHash remains flat, no matter how many miners are on the network. Subsidy reduction would be in accordance with Moore's Law.
I believe both of these address a lot of the problems recent altcoins have had with their launches, although the difficulty based solution is far more easier to implement that the time based one.
well, this are 2 completely different concepcts, and none of them is even slightly close to the original
1. time based reward
this is fail by design. super unfair distibution. you cannot distribute by time based on global difficulty and current protocol.
2. difficulty based reward
nothing is changed, just another altcoin.