I just build version 0.3 of my Pebble NMBS app, which is the real first beta. I added the station choice as user configuration items in this version. It took quite a while to figure out how to implement this, as the CloudPebble emulator seems not to have the support for testing this. Anyhow, the next steps are adding app metadata, such as official icons and a screen example. And I'll probably need to change its name before I can release this app on the Pebble appstore.
I also remarked that there is already an NMBS app on the appstore although in French. Seems that both apps have quite some similarities, although my app shows more info ;) Anyhow, I like some competition.
After the appstore release, time to dig into PebbleSDK 3.0, so the app will have Timeline support when I'll receive my Pebble Time Steel !
Edit : and it's live on the appstore !