Howdy,
 
>if (MoveMode == PLAYER_PTZ_VELOCITY_CONTROL)
 
needs to be changed to:
 
>if (MoveMode == PTU46_VELOCITY)
 
This is in line 678 of my slightly modified ptu46.cc
 
Velocity mode will not work in the current ptu46 driver, and this fixes it.  
 
There are other issues with ptu46 that I'm working on. 
 
 
Regards,
Greg