Mindmap-style rendering would be a killer feature for me as well - One of my favourite aspects of The Brain (app) is being able to view notes and hierarchies of notes in siloed chunks like that (makes it easier to focus), as well as the fact that the text is arranged neatly in a legible way (as opposed to how a lot of graph visualisation libraries spread things out randomly which makes scanning the notes under a particular domain difficult). So, very much looking forward to something along those lines being implemented in Dendron.