Unless I am entirely wrong the last buy/sell trading indicator seems to only trip if the current buy is at least some percent different then the last buy before the one you just posted. At least on BTCe that's what I noticed.

Using last and greater or less then some % for buy or sell and that does almost exactly what I wanted. Just not the way I was hoping. I do like the idea of some % above or below the last buy or sell. Still it does work with last and limit orders.