Music player support has been added with some commits after 0.5.
The stock music player is not supported, but it could work (i did not test it yet) with the latest skippingstones musicplayer patch.
The support is based on the MPRIS dbus "standard"

I also would like support for pebble dialer is there the sourcecode available or other infos to extract the app-messages ?

I primary worked on the notfications and continue working on them until they are less spammy and can be filtered with settings.