In addition to general blacklist improvements, I'd also like to see blacklisted words / phrases that will auto-intercept tells.

When's the last time you got a legitimate message with hearts, ".com", "USD", "$" or "hello friend" in it? Never.

If SE isn't willing to fix the problem (and it IS fixable), then let us fix it. I'm tired of having to play games like /busy, creating a tab just for tells, etc. to stop the spam.