MKVToolNix can do basic subtitle work - complete retiming and stretching. If that's all you need, then it's certainly an alternative.
With that said, all of the options mentioned thus far were likely made under the assumption of wanting to archive a copy of the video that has good subtitles. For stuff that you're going to watch once and then delete, using the subtitle delay setting in your media player of choice is the fastest way.
In the case I mentioned in post #4, the original files came from a torrent I wanted to keep seeding and I didn't want to use up extra space with duplicates, so demuxing the subs and editing them was the only way.
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