I added this request to be taken on board for the re-design of the site, not to be done as superurgent new feature.
In my humble opinion, "re-vamping the whole site" may be the priority as this has become an important issue for the site.
A better spam detector is a useful feature but one that can probably dealt with as "evolutive maintenance". The same for other specific detailed issues.
First re-construct the site, and afterwards one can look what still needs to be improved.
The issue of course is to have the discipline to list the tiny issues and deal with them on a continuous basis BEFORE they grow to become a dealbreaker for the users
Yes, been there, done that
Good luck with the programming