Yes, it is like a fold, exactly.
The best example I can think of is this,
I watch American Idol, Survivor and JAG. I want to write a post about this weeks shows for all three.
I want to write about what happened on AI but I don't want to spoil it for anyone who might have taped it but not yet watch it.
Then I want to write about JAG, but I don't care if anyone reads the comments since it probably isn't going to ruin the show.
Then I want to write about Survivor, again, not revealing anything for those who haven't watched yet.
With the current more tag I have to carefully order the content so that JAG comes first, then the other two. But even this won't be ideal because the person who watched Survivor, but NOT AI will be sent to the American Idol part of the post when they click the more link if it is first.
With the lj-cut tag you can use mutliple tags so that if you just want to read more about Survivor you can go to the post and it will anchor to the Survivor section.
I have spent several hours trying to hack my way around this (without hacking on the more tag itself) and I am stumped....every tag I try to make gets eaten by WP :)
standard html style braces
But they all are getting parsed out before my filter is called, so I lose them. I have a working filter that correctly parses all four tag styles, I just can't ever get the tags to make it to my filter.
The html tags get mangled when I save the post to the db, I have no idea which function is causing that. The other 3 seem to be filtered out in the display code because they survive the trip to the db.