I have this little problem with the speed slider. If the speed slider is set to 15 and below, zooming in or out will no longer work and when I set the slider to 4 and below, pan and tilt will also stop working :-(
I"m seeing similar behavior. It's like the speed of zooming in and out is very slow relative to the speed of panining left/rightup/down.
So if you set a good speed for zooming, your pan speed is lightning fast.
If you set a good speed for panning, your zoom speed slow or nonexistant.
I almost wonder if each time a zoom/pan button is pushed, a speed value could be sent prior. So if you click left, it can send a low speed int and then pan left. If you click zoom in, it can send a higher speed int and then zoom.