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I have a new idea for Dolphin file manager.
i like dolphin to have a button to "play all" music tracks in a folder with a given music player.
Ms Windows file manager has this option but dolphin has not.

you can already do this by editing the file associations in systemsettings

systemsettings -> file associations -> search for directory -> inode -> directory -> add

add amarok with the proper/desired options and then move down to where in the service menus you whish it to be

Options:
-r, --previous Skip backwards in playlist
-p, --play Start playing current playlist
-t, --play-pause Play if stopped, pause if playing
--pause Pause playback
-s, --stop Stop playback
-f, --next Skip forwards in playlist

Additional options:
-a, --append Append files/URLs to playlist
--queue Queue URLs after the currently playing track
-l, --load Load URLs, replacing current playlist

DIY

Play All Media Button for Dolphin: viewtopic.php?f=223&t=140139