Feature request: Keep-subs

[keybounce]

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We have keep-fragments
We have keep-video

We have "-k" which will prevent subtitle files from being deleted on conversion or embedding.

But -k also keeps videos on format conversions.

What I want: Keep the original subtitle (in case I ever get something that can work with .tt's), yet still embed a workable copy into the video.

(For that matter, if I ask for "--convert-subs ass", why do I wind up with .srt's as well? I thought ass maintained formatting, and srt was just plain text + timestamps).