You can link to a topic with just the number: /topic/1. Everything after that is fine. If your browser copy pastes urls like that there isn't much else that can be done.
Unsolved Embed URLs and stuff
Not sure what you guys call it, Discourse calls it one boxing, but is there anything in NodeBB or an add-on that takes URLs to like Twitter, YouTube, etc, and embeds the data inside a post instead of just posting it as a URL?
It's called nodebb-plugin-iframely, not updated to
v1.x.xyet thought. Created issue https://github.com/NodeBB/nodebb-plugin-iframely/issues/16 for this.