SP 파워다운 기간을 3일~7일로 단축할 의향이 있는가?
(Are you willing to shorten the SP power-down period to three to seven days from current period? )

Yes. Shortest should be 7 days in my opinion.

스팀 블록체인의 다운보팅을 제거할 의향이 있는가?
(Are you willing to remove down-voting policy of STEEM blockchain? )

Downvotes should be able to be removed from communities with SMTs. Not from the main chain. There's a compromise to be had there.

스팀 블록체인에 스마트 컨트랙트를 도입할 의향이 있는가?
(Are you willing to introduce smart contact into the STEEM block chain? )

Yes. Would you support a dev proposal for such work?

유료 구독 모델을 도입할 의향이 있는가?
(Are you willing to introduce a paid subscription model?)

Potentially. I don't know what you mean by this but increasing revenue for users is a good thing to me.