There are already some wonderful suggestions by everyone in the comments sections.

Regarding the steem only posts, I think STINC is more worried about not posting on HIVE and that makes perfect sense. People in this community just have to be honest.

If STINC is indifferent between posts and comments then I think engagement should be encourages using the extra SP. May be you can focus on rewarding people who make insightful comments, comments can be as long as posts sometimes, and insightful comments help the author and those reading learn more.

I will try to do a few steemit only posts to contribute.