It looks like I may need to adjust some of my assumptions about this project. I always considered the SUP files to be what everyone would want, and the SRT files as this weird intermediate text-only format that was only good for making new SUP files. It looks like the SRT files may be something people want as a final product, and as such I'll go through and close any italic tags left open, just to help with compatibility. This may also mean I'll break the downloads up in the next release so that you won't need to download all of the huge SUP files just to get the tiny SRT files.
Haven't had a chance to go through all of this yet, but numbers, yeah, numbers are where it gets weird. Numerals are always easier to read than text, and numerals should be broken up into groups of three or four at the very least as well. Except... I just can't do it. Yeah, I'm violating my own cardinal rule about readability here, but I'm just that way. In English, you should spell out numbers less than 10-12, and use numerals for larger ones. In addition to that vague area in the 10-12 zone, there are a ton of exceptions and one-offs, such as when numbers comprise a good chunk of the sentence they're in, spell it out, and so on. And then there's the longer numbers... I just can't add dashes to a number unless I know it's SUPPOSED to have dashes. So I look around at scripts and official subtitles and try to find something authoritative which tells me whether or not to put dashes in there. But if the authoritative sources all say just dump a row of seven numbers all together with no spaces, that's what I'm going to do. I'll take a look at each of the ones you pointed out, but I'm just saying there's no satisfactory answers on this front. If in doubt, I won't, and numbers are full of doubt.
As for the text changes, I still need to listen for those.