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I think the same code is used for all XOOPS comments, it's handled in one object that does all the html stripping and converts the [square-brackets] tags to their equivalent html. Adding the things you're wanting would only be a matter of a few regexp's and some database hits, and it would be a really cool for a church site or another Christian Community-type site. (getting it to do red letters, now that would be tougher.)
I wrote a function a while back that would take arguments of book, chapter, and verse, and hit a database and return the KJV text of the verse. I was pondering at the time the idea of doing the same thing you're wanting, but it was just one of those Saturday morning "I wonder if I can do this?" kind of hacks and I got distracted with other things and never finished it out.
I just spent a while looking around for my code, and I fear I might have deleted it in one of my system upgrade rampages. I did find the MySQL dump of the KJV Bible if it would help. Hey, if nothing comes up this Saturday I could probably code the thing, but I can't make any promises about that. I also have the KJV in XML and some other Bible markup language. (I don't think the KJV is the "one true translation" or anything, it just seems to be the one most frequently located in such hackable data formats.
) Just lemme know if any of those interest you, I would just spam you with them but they're a good few MB apiece.