Unfortunately, I don't think that a vertical endoscope camera mount would help with aligning the probe. Removing the probe and mounting a camera would invalidate the tool calibration. This means that while you could mount a camera and find the pad center, this won't guarantee that the probe and dispenser will be centered as well.
You may have noticed that each time a tool is mounted, the printer does a short calibration routine in the X,Y, and Z axes. This is because of the variance that's introduced between different tools, or even between mounting the same tool twice - the position could have changed as much as 200 micrometers, which would definitely lead to alignment problems. This is also why we advise users not to move the tools after the XYZ calibration, or at least to release the motors and allow the system to re- calibrate.
We have another camera jig we use internally that snaps on to the dispenser and probe (which lets us monitor dispensing or probing up-close), but this requires a relatively expensive microscope camera which makes the whole assembly cost about $1,500.