My suggestion is this: allow for an extra little option for the editor that has the same function as but isn't called a spoiler, but a cut-off (or another word that fits).
Its use would be to cut off long messages here and there to shorten things up.
Example: you have written a couple of paragraphs but it's too long, so you decide to leave the main phrase(s) (top and/or bottom of paragraph(s)), but rather the top) and cut off the rest(s), so a reader can just click ze button.
Example: it's used to cut off a piece of text if it's not so necessary to display, as it's not the main issue.
If I recall well, it's also used at Livejournal (LJ), though it functions differently. I think here on the ORG a simple copy and rename of the [spoiler] function would do quite well. And then to maybe make it more subtle as you open/close the text. Maybe a blue "link-like" text of "Read more..." at exactly the spot where the text should be, and to not have a window like [spoiler] does.
Sound good? :)
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