@mdma, @Moors7, @helxsz, for now while it is not implemented yet in firmware, users can take control of the breathing behaviour of the RGB with this library I created: https://github.com/GrtVHecke/ledbreathe
also mentioned in this topic: Led Breathe library: User control breathe behaviour for the RGB led on Particle devices
Hope this might help a few people while the guys @particle implement this breathing behavior in their firmware