Yeah, if you fly with SL on it will act something like a coax heli. It will self stabilize when you return cyclic to center. It will prevent you from getting too much angle in either aileron or elevator directions (this is on e of the advanced items I mentioned in our discussion, you can change the maximum angle it will allow for bank). You can also change the SL gain which will control how aggressively it returns to hover when you center the stick, or how aggressively it will fight you as you try to bank from stable hover.
Need to be careful with both. Too small an angle setting and you'll find you do not have enough bank range to be able to stop in short distances while in FFF, or perhaps even hovering manuevers depending on how small the angle you set. Too high an angle setting and it will be an oddly restricted CP heli in term sof bank angle and you can find yourself inverted but unable to quite complete to full inverted and cause problems recovering. Too high a gain and it will likely oscillate around level and perhaps even overshoot and go into instability. Too low a gain and it will not self level at all and end up being just a bank angle restricted CP model. Perhaps useful as a last stage in training someone on CP helis, but also dangerous if you expect it to actually self level. Make adjustments from defaults slowly and test thoroughly before trusting it in any way.