Yes,this kvm switch support extended mode and mirror 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 8k@60Hz,4K@144Hz,2K@165Hz,1080P@240Hz
The USB port of this 8K DP KVM switch is standard 5Gbps USB 3.0 version
Sorry,it can not support hoteky switch,it only support one-key switch and extra extend cable switch
yes,of course,but we suggest that use high quality wired keyboard and mouse