You should try experimenting with POS only with fees going to the holders, also it would be best for it to be fully premined over a short period and distributed mostly with trusted escrow, less with exchanges. If you premine the entire thing that also means you can use sha256 for it so you end up with a much slimmer blockchain and you don't have the tens of thousands of inputs that multipools create so you can effectively decrease the size of the blockchain by some 50-60% so with a 2 minute blocktime you might have a 200mb Blockchain after a year.

Multiple loadable wallet.dats so that you can section off your coins in separate wallets so you aren't spending your oldest coins or even have seperate accounts.

Anon that generates masking addresses when sending to other people.

Coin control

Option to send using minimal coinstake

Adjustable Stake thresholds so you can set which the point at which your blocks will split or combine.

Bitmessage for escrow and smart contracts

Built in block explorer

Statistics (generally all the stuff you see in getinfo)

Stake for Charity

Built in trade api to trusted exchanges