Uploading images in comments will be in the next update, along with a fix for the inbox count bug! We're also working on a Mark Read on Scroll option, a Modlog page and support for moderator actions (which have all been highly requested features).

Unfortunately, full markdown support is rather tricky to do. We've done some deeper research into how we might implement this since the last time it was suggested; it's a large undertaking that would require some significant time input, but it should be possible. It's not something we're scoping for the upcoming update, but it's something we hope to dedicate time to further down the line.