There's a few open issues/PRs that I'm working on getting in! Feel free to drop any request there (it's the best way for me to track it).

For UNREAD messages... Sadly, I'm not sure that Slack has an official API for that. There may be an "unofficial" API there that we could discover, but I'm hesitant for adding support there. With that being said, it's not that I wouldn't entertain the idea (it would be REALLY useful) but it would require a bit more thought.

thanks yeah... am a total noob to the api so have no idea but i guess just based on principle if you can see everything the slack webapp sees then it stands to reason the info about the unread messages is SOMEWHERE in there

Yeah you're definitely right, it's there. It's just an API they document so it's subject to change etc (which presents some challenges)