Also, [x] standard deviations away (SDs are a 'standard' feature with VWAP displays

Enter trade only if:

spot [>/<] [VWAP] [+/-] offset [x][%, $, SD]

This would allow entry of a trade only if price is below the 1 standard deviation above i.e. a little up/down is OK, but if market is truly zooming we don't want to enter a DC just yet