The dev of v0.2.3 is finished about 90% and the plugin could be released without the last 10%.
This last 10% represents the possibility to overwrite the Gallery3’s configuration with the photo or album picker ( with the visual editor of a post or a page).
I would release the v0.2.3 the next week without this feature ; this feature will be re-introduced in a futur version.
I would reconsider my position if many users of the plugin make the request.