It will be unfair to the reward pool to shorten power down period from 13 weeks to 3 or 7 days, this will cause some serious disequilibrium to the payout window which is capped at 7 days. If you want the PD period shorten then payout window will also be shorten and steeming will lose it's purpose.
Also I know a witness adding value to the chain, whom runs a decentralized banking service. This will hinder such service that has being a life saver to the community in dire times.
Other requests looks negotiable.