ok, found a partly answer .. just add the attribute:
piklist('field', array(
'type' => 'select'
,'field' => 'select'
,'label' => 'Select'
,'value' => 'third'
,'attributes' => array(
'multiple' => 'multiple'
)
,'choices' => array(
'first' => 'First Choice'
,'second' => 'Second Choice'
,'third' => 'Third Choice'
)
));
partly, since piklist doesn’t save multiple selects and select.php in /piklist/parts/fields/ doesn’t handle multiple defaults (eg value => array())
Anyway, this is easily fixed and as I said above .. I <3 piklist 🙂