Maybe I am talking BS here but have you considered using spacers? A 
custom widget that is a container holding the list item and the spacer
aligned vertically together.
http://demo.qooxdoo.org/current/apiviewer/#qx.ui.core.Spacer
or maybe a grid layout with one column and eg. the even rows act as spacing?

I don't know if what I am proposing are proper ways or  hacks. I am 
learning as I go and just shooting ideas.

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