Right now you can add tags to cards, but you can't group vertical lanes. Though a do plan to add groupings or epics eventually, it would actually be very convenient by its current architecture.
Yeah I consider adding caldav support eventually, but I need to read about it a little more and experiment a bit to see how much complexity it would add to the project. I really want to keep it as simple as possible in regards to both setup/installation and how it works, so I need to evaluate it properly to see if it's worth it or not
Sorry I made the mistake of copying the same post from reddit without updating the links, it's fixed now. Thanks for pointing out