Skip the hack. There's another way, although it's not obvious and isn't properly outlined in the documentation!
Basically, it's possible to add any "data-setting" attributes (e.g. data-settings="initial-overlay-enable:false; volume-enable:false; autoresize:fit"), but you have to drop the "data-" part off and add it to the shortcode.
So basically, in the shortcode, just add settings="autoresize:fit" to the shortcode.
e.g. [sublimevideo poster="image.jpg" src1="videoSD.mp4" src2="(hd)videoHD.mp4" width="640" height="360" settings="autoresize:fit"]
Important: If you also notice, additional settings can be added into the "data-settings" but you must separate them using semi-colons.
Hope that clears up some confusion for other plugin users. Also hope the documentation is updated slighty. :)