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I appreciate the built in options to share to popular social sharing sites like Facebook, Twitter, and Tumblr, however I'd like to be able to specify whether the synth automatically loads along with the rest of the page and automatically begins playing when loaded and specifying the viewer dimensions, just as I can when generating the embed code to paste manually.
I'm assuming that you want to make sharing to the most used social sharing sites as simple as possible, but I see no reason why you couldn't hide the so-called advanced options as you do on the Embed code tab.
I make a point of Tumblr and Twitter and not Facebook, simply because Facebook does not yet support interactive embeds in the main news feed as you've explained elsewhere.
The viewer will have a constrained width in Twitter (and I suppose in Tumblr as well, although that will vary by the theme which the user has chosen), but perhaps you could at least make the viewer's aspect ratio fit the input images or the user specified viewer dimensions.