Yes,this kvm switch support extended mode,mirror mode and crisscross mode for all system.
Yes,it support the resolution of Displayport up to 4k@60Hz,2K@144Hz,1080P@165Hz,and support the resolution of HDMI up to 4k@60Hz,2K@120Hz,1080P@144Hz
The USB port of this 4K HDMI DP KVM switch is standard USB 2.0 version
Sorry,it can not support hoteky switch,it only support one-key switch and extra extend cable switch
sorry,it can not,it only support high quality wired keyboard and mouse