2. Eh, took a bit of thinking, but... I really don't know how you're going to do that - if you're talking about ff.net, that is. What with the summary character restriction and all that. I kind of understand what you're talking about but you can usually get it from the summary itself. If the summary talks about some bright happy thing, you can usually assume it's fluff and all that.

But, truly - angst, sap and fluff... Sometimes these are part of the plot, and you can't really warn against it.