The best extension is one that does the job it was initialy designed more and nothing else.
If I wanted to add social bookmarking to the content I would have installed a specialised social bookmarking extension - it will probably handle it far better than your photo galery and offer more specific features.
Concentrate on making your extension do what it was designed for and not in making a "one size fits all" extension that will probaby fail to satisfy anyone's needs but your own.
(Apologies to the author of this image for not crediting you but I can't remember where I found this image)