Wireless Simulator On Betaflight 3.4 + Using F4 Flight Controllers

Coming in Betaflight 3.4 + You can now turn your Flight Controller (only on f4 of above, f3 is not supported)  into a HUD device, meaning if your fc powers your RX, you can use it as a wireless simulator!

Simply goto Betaflight CLI and type the following

Set usb_hid_cdc = on
save

Be sure to turn it back off if you are going flying.