Auxiliary heater VL7, how to? When driving?

[G-A-R-Y]

I have the aux diesel heater that pumps hot air out of the dash for a predetermined time, it comes with remote and is option "VL7".
Today whilst driving I pressed the heater button (bottom left overhead console) whilst driving and it activated, the heater and gauge warms up really quickly, when I parked up it continued to run until set time had expired.
I didn't know it did this and never read anywhere about this useful feature. Is there more that it does??

 

[G-A-R-Y]

Can anyone explain the reasoning for the last bit in bold and can it be prograped out.

When the vehicle is at a standstill, the auxiliary heater can be activated up to three times in succession with a running time of 60 minutes, for example. A complete heating operation with the maximum possible running time of 120 minutes can be performed only once in full when the vehicle is stationary. The auxiliary heater then prematurely switches itself off automatically or can no longer be switched on. In order to switch on the auxiliary heater again, you must first move the vehicle by a distance of around 30 m at a speed of at least walking pace.