This is a pretty good package, but I noticed that the differential throttle control is not implemented in the CFS3 version, whereas it is fully functional in FS2004.
This means that in CFS3, if you're using a separate lever for each throttle, as supported by the CH Products Quad Throttle, then you cannot use high power on the port engines coupled with low power on the starboard engines to perform a right turn when taxying. Nor indeed can you use similar techniques to correct your take-off drift, or sweeten the accuracy of your Bomb run.

I got no reply from their support site, so far, but comparing the aircraft.cfg files of both CFS3 and FS2004 versions, I notice that the FS2004 version carries the following engine information:

[GeneralEngineData]
engine_type = 0
Engine.0 = 10.969,-21.277, 1.204
Engine.1 = 13.219,-9.833, 0.092
Engine.2 = 13.219,9.833, 0.092
Engine.3 = 10.969,21.277, 1.204
fuel_flow_scalar = 1
min_throttle_limit=0.000000

The CFS3 version has zeros for every engine, suggesting that it is modelled with all four engines in the same central position, right on top of the Centre of Gravity.
I wonder if this is an error, or a deliberate omission, possibly to enable the AI to fly the aircraft more comfortably?

I guess I should try pasting these new figures from the FS2004 version into the CFS3 version, and seeing what happens.

Just curious if anyone has come across this before, and already has their own fix.

Okay I've tried pasting the FS2004 engine data from the aircraft.cfg into the CFS3 aircraft.cfg, and the Belle now has proper differential throttle control.
How come Just Flight didn't notice this? Maybe it's something to do with them being more interested in FS2004 than CFS3. But at least they gave us 25 Missions to fly in CFS3, for which I am grateful. They are certainly good templates for making your own 8)