What is the correct LIST syntax to add 'delete' (item) functionality?
Not exactly what you asked but this is how I solved this. ;-)
In the plugin List template I have:
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<a href="tiki-tracker-remove_item?trackerId=11&itemId={$row.object_id}&modal=1" class="btn btn-danger text-white click-modal"><i class="fa fa-trash-alt"></i></a>
It create a red button with a trashcan (I guess we can also use the button or even the icon plugin too)
;){kind=link}
;){kind=link}