Support Question

Hello there, first of all, thank you for this wonderful library.
I've been using it instead of regular javafx for the fast few while and I really enjoy using it. However I have encountered a few roadblocks.
What would be the correct way to emulate the infamous "fit-to-parent" AnchorPane functionality? My so far unsuccessful approach was something like this:

(controls/anchor-pane
  :children 
    [(controls/some-control 
      :anchor-pane/top-anchor 0.0
      :anchor-pane/bottom-anchor 0.0
      :anchor-pane/left-anchor 0.0
      :anchor-pane/right-anchor 0.0)])

But for some controls (ImageView cough) I know, this just won't cut it in the long run. So are there major hurdles for the nested-properties branch to get merged? I looked at the source and am looking forward to the :bind/property syntax with [:id :prop] values. I don't really get the complete picture of what is depending on what right now, but with some pointers I would like to look into this and help if possible/necessary.