because can do it with the available (shortcut) functions maybe?

not neceserally. there is the +=value -=value to increase/decrease the current value

you didn't mention what the joystick sends you in the vMix shortcut defining in order to play with the position values

for other than ptz camera inputs one can use virtual ptz controls

?t=1135


using external app/script that has posibility to read joystick data combined with sending functions to vMix a lot can be achieved

The trick is to continiously read the throw of the joystick (the resistance value) and convert that to a +=value ( small throw = low +=value, larger throw = larger +=value) . the size of the step (value) = the speed and when at zero throw to not use any +=value meaning position is maintained (scripting) . Combine the x and Y axis throw convertion step and you will get the diagonal .

thats how it is done in the video be it with a arduino to convert to the PTZ VISCA Protocol . Same principle for using the vMix functions

Well, this script didn't work (generated by ChatGPT):

Function JoystickMove()
'Get the current position of the layer
Dim x As Integer = Layer(1).PositionX
Dim y As Integer = Layer(1).PositionY

'Get the current scale of the layer
Dim scaleX As Integer = Layer(1).ScaleX
Dim scaleY As Integer = Layer(1).ScaleY

'Get the joystick input values
Dim joyX As Integer = Joystick(1).X
Dim joyY As Integer = Joystick(1).Y

'Calculate the new position of the layer based on joystick input
x += joyX * 10
y += joyY * 10

'Calculate the new scale of the layer based on joystick input
scaleX += joyX * 2
scaleY += joyY * 2

'Set the new position and scale of the layer
Layer(1).PositionX = x
Layer(1).PositionY = y
Layer(1).ScaleX = scaleX
Layer(1).ScaleY = scaleY

End Function

'Call the JoystickMove function every frame (30 times per second)
AddPeriodicCallback("JoystickMove", "JoystickMove", 33)