Ps4 button mapping and mouse problems

Im trying to use a mouse with the game while using ds4 for certain things but doesnt seem to work and not sure if its because the touch pad is being used kinda annoying not sure if its a bug or something wrong on my part.

also wanted to know if u can use the setting for R2/L2 ti bring up a extra cross menu is it possible to map extra actions to it doesnt seem to let me if i try to edit it just shows me my main cross menu

I don't think so but that would be great if you could map other cross hot bars to different buttons.

What you trying to do with the mouse? The touchpad and mouse can be used together and if you want extra cross hotbars you have to hold L1+X for example to take you to empty bar and then you can add stuff to that bar then just press L1 to cycle through those hotbars that have items on them