When I do scalps, generally I will increase positions if markets keep going down. This alloction profile is built into the RAIM profile.
I set up the model so I could modulate the daily entries across the backtest, and as such I was able to come up with a scalp entry profile that works pretty well over time.
I do not really have a method of trading the short side with the trend, mostly FBSOP.
As far as the long side when we get a bull market (even within a Bear), I typically keep a baseline long position and modulate positions as market moves up or down.