Talking about stems...

[Paul Dumais]

Is there a way to produce any sort of unusual stems?

For example: a stem with an arrow head on it.  This is usefull for
noting flamenco guitar music.  An arrow pointing upwards on the stem
of a chord means a (down) stroke with the a right-hand finger.  There
are many effects on a guitar, flamenco or not, done with the right
hand that are often noted with special stems (arrows, zigzags, etc.)

I know that the possibilities are endless, but any indication on this
topic will be appreciated.

-- 
Paul (a newbie)