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Actually it allows to update hardsubed video stream too (without remuxing), but only when source (before update) and destination (after update) files have exactly the same lenght. If lenghts are diffrent even about a byte it can works unpropertly.
But in next version I'm going to include updating any types of data, both diffrents lenght and the same lenght. Something like a binnary diff from Linux systems. I hope it will be sucessfully done.
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Please have a look at the following 2 programs / projects:
Zidrav:
http://sourceforge.net/projects/zidrav
PAR2:
http://parchive.sourceforge.net/
They allow byte patching, and par2 even works if there's a (little) offset. So, yeah, such tools already exist ^_^
Why aren't they used more (I've seen at least 1 zidrav or similar patch, but don't remember from which group)? Because it's usually more hassle for both sides (encoder & leecher) to create/apply the patches than just to reencode/click on a BT link.
I haven't looked at your program, but an automatic softsub remuxer seems like a good idea. But then, I don't remember seing a v2 softsub release ever
CU,
lamer_de