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There are two app loaders you can use (additional to several ways of running your own). One at https://banglejs.com/apps/. That one needs manual intervention by @Gordon to be updated and should contain more stable (older) apps. The other one is https://espruino.github.io/BangleApps/ and is automatically up to date with all accepted pull requests of the Github BangleApps development project. The pull request you mention (https://github.com/espruino/BangleApps/pull/2778 ) has been merged two days ago and is available since then on the development app loader.
I contacted Romanisthere, the developer of the watch face "Pebble with distance and steps" about adding US units and PM/AM locale, which he did and didn't take the money I offered (Big thanks to him!). However, his app was updated yesterday, and still the BangleJS app store doesn't list his 0.4 update.