I would be interested to hear how people get on with PC based joysticks and BI. I tried a Xbox controller with BI4 and it was a bit hopeless really. Seemed to work much like a digital controller instead of analogue, so was super clunky. I assumed that this was because BI was unable to pass on analogue movements to a PTZ camera. I use a network Hikvision joystick now with my Hik cameras and it is much better and does work in an analogue way, so I would imagine a dedicated Dahua joystick will probably function much better for you, unless the controller code has dramatically improved in BI5