Not working on it (yet), but I wish the jj <-> github story was a little more ergonomic.

Additionally, I am really missing support for stacked diffs, ie, easily pushing a number of commits into one PR on github each such that they all show their incremental diff.

ezyang's gh stack was pretty useful, if a little bit fragile [0] and graphite.dev is also very nice, but paid software with a strong VC based motivation to become everyone's everything instead of a nice focused tool.

[0] https://github.com/ezyang/ghstack

I'm also not super happy with the default 3-way merge editor, but often cannot use vscode or other GUIs.