One of my favourite things about Sketch is the plugins that are being made by designers for designers. What I don't really like is having to go to different sources and installing them manually. Not because it's hard or a pain to do, it's because when an plugin gets updated, I won't have a way of knowing until I read about it somewhere.
It would be nice if there was an interface within Sketch where you could browse plugins to see new additions, updates, reviews, etc. Could also pave way for paid plugins that offer more functionality.