RR, not true. I've been using auto TDC in SH4 and still hit where the crosshairs are aimed on the target, with the scope unlocked. And GWX has nothing to do with it.
You might want to check the discussions before you jump in and say it can't be done. Maybe you can do it in SHIII also but I've never tried. SH4 is the first I've heard it being done, as others have done it and said so. That's the only reason I tried it and found it works with SH4's auto TDC too.