Personally I'd like to see The amount of steem power of the followers to be factored in. I've seen serial spammers with 200+ followers as they tend to follow each other. From my experience, Average comment length and reply length is also a very good indicator of a productive steemian. I'm not a professional programmer. So I don't know how implementation would work.
There are multiple ways steemians produce quality on the platform. So personally I think the follower count, comment and reply length, average post value, Average comments per page and steem power are all good indicators. So it's wise to incorporate them all.
He/she is fighting the good fight for steemit. I have no affiliation with him/her. I just came across the account and it's really something I've wanted to see after my almost effect-less attempts to flag serial spammers with my minnow account.Also I'd like you to check out @miti's effort to combat spam. You can read it here: https://steemit.com/steemit/@miti/my-commitment-to-making-steemit-a-place-free-from-spammers
Please go check it out.
@vimukthi :
Thanks for the input. Good luck with your work!
Thx!