Assuming he/she has an image editor that supports transparency...
He doesnt.

It's ok guys, thank you very much for your replies. Im still hoping that an offical programmer reads through these posts for ideas and fixes they can make for future builds for OD+.
Since this functionality is not built into OD+ v1.9, i have reverted my zoomer dock as it seems to be called back to an opaque state.
Thanks again.