Okay, I'm happy to use this opportunity. Not only because of the current situation, but because I think there have been a lot of misunderstandings with me, @curangel and its team the last months.

Are you willing to shorten the SP power-down period to three to seven days from current period?

I personally like the longer power down, because it prevents me to take emotional decisions. I'm sure it is a big reason why I'm still interested in this community after 4 years. I also understand that other characters might prefer to get liquid sooner.
As other witnesses said, <7 days is difficult due to double-voting concerns. But 7 days+ for the voting stake is absolutely no issue. I would prefer when stake used for witness and SPS voting needs longer to unstake, to prove a long term commitment with these important decisions.
I am not trying to enforce my own opinion on everyone though, so if a decision between two technically sound solutions has to be made I generally try to take up as much community feedback as possible and act accordingly.

Are you willing to remove down-voting policy of STEEM blockchain?

Definitely for communities and their SMT when they choose so.
For STEEM, I deem it very important to have a countermeasure to excessive self voting. If that didn't exist, I would have to self vote myself all the time, and could not use all my stake to support as many small users as possible just for the curation rewards.

Are you willing to introduce smart contact into the STEEM block chain?

Smart contract platforms do currently have scaling and other issues. But if a good solution to the problems which became emergent on all these platforms, which had to fight with chain congestions and even halts, is found, this would absolutely be a worthwhile addition. Requires time and funding though, something as complex as that can not be rushed.

Are you willing to introduce a paid subscription model?

Yes, either in the ways already described by for example drakos, or even better an implementation that automatically burns a percentage of the subscription fee.

I really appreciate these clearly formulated questions, and welcome anyone who wants to approach me with more to meet me on discord, write me an email or comment on a post of mine. I have always tried to be accessible to all parts of the community and especially to the non-english ones, and hope we can all find ways for better communication in the future.

I have a request too: If anyone can connect me with a curator who is interested in searching for exceptional but undervalued content in languages curangel doesn't cover enough yet, please do so! I have made several attempts especially for Korean, but unfortunately did not receive replies so far.