Here is a partial list of planned features, as well as some notes.
There are various strikethrough (
~~text goes here~~) extensions ,  for the
league/commonmarklibrary that Raddit uses to parse Markdown, but neither have been updated for newer versions of the library. We would have to fork either one of these extensions and maintain it ourselves.
Another approach would be to configure HTMLPurifier to allow
<del>tags, but AFAIK this would require reconfiguring the entire list of allowed tags, which is a pain. It would also require disabling the CommonMark library's HTML escaping, potentially altering the formatting of existing posts.
Strikethrough is not offical Markdown/CommonMark syntax, while HTML is explicitly supported, so in the interest of cross-compatibility and open standards, using
<del>tags would be better. However, this is a pedantic and technical argument that sacrifices user experience for the sake of purism, so we should probably go with the first.
- Per-forum user bans
- Global user bans
- Banning of phrases
- Ability to preapprove some contributions under certain conditions (e.g. an ongoing brigade from Tor users would lead to posts from all Tor users being sent to a moderation queue)
Some algorithm that marks users as trusted
- Example use would be the ability to circumvent IP bans on their accounts.