How to add just 1 song to playlist?

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When you double click on a track or draging a track to
playlist editor view, the default behavior is to play only
this track alone (tracks you see in italic are planned
tracks: tracks that will be played when selection is done).
Note that you can change the push or play behavior in the
Parameter view/ option tab or using a right click on the
track -> push to add a track  at the end of a selection.
what do you want to do? play only a track and stopping sound
(in this case, click on the continue mode switch near repeat
button at top) ? playing a track in repeat mode (in this
case, make a right click -> play repeat) ? 

Please have a look at
http://jajuk.sourceforge.net/jajuk-hs/default/html/pm.html