Experiencing this same issue as well. I normally have "toggle aiming down sights" bound to right mouse button, while having the "raise modifier" double-bound to my mouse 5 button and right mouse button. This would allow me to hold down right click and immediately have my gun go from idle and straight past hip-fire into ADS, while using the mouse 5 button for hip-fire. It seems the "toggle aiming down sights" function in the combat settings no longer works at all. I've tried to bind multiple things to it while having nothing bound to the raise modifier, and nothing has worked. The only way to full ADS is to single click right mouse button, or whatever is bound to the "raise modifier", which honestly feels horrible and has already caused issues for me. Instead of "toggle aiming down sights" controlling ADS, the raise modifier now has assignment over everything. Not sure if this is an intended change or a bug but it ruins gunplay for me sadly.