Well I think I did that ...
@ Visual Bindings it does point to the Out Attribute.
and yeah it's what I am planning to make as well. "Datastore chooser" is a nice name for it. Image may be NSFW.
Clik here to view.
here is a link to the workflow
https://dl.dropboxusercontent.com/u/11346855/Display%20all%20build%20datastores%20test.workflow
