Control over softsubs shadow size.
 

While it's not too bad the way it is, it would be nice if you could adjust more than just the shadow color and being transparent/opaque. This is where the size would come in handy. I don't know much about how subtitles are rendered over the video, or how easy this feature would be to add, but it'd be nice to know if it's possible. Thanks for listening!

-Shimi