Answer: Yes, it is perfectly safe, the TCU controlling DSG gear changes will prevent you from doing a "money shift", and it will also change up to stop you over-revving the engine in too low a gear, similarly it will change down a gear at too low a revs in too high a gear (see explanation below).
The 7.5 DSG (DQ381) has two different "manual" modes.
"True manual mode" is activated by moving the gear lever to the left (when in D or S), and this stays in the gear you have selected unless otherwise instructed (by moving the gear lever forward or back or pulling on one of the steering wheel paddles). While in this mode kickdown to a lower gear (when you floor the accelerator) will be disabled.
Note that with a standard DSG tune the TCU programming will protect the engine by changing down a gear if the revs are too low, or changing up a gear if the revs are too high. This protective behaviour (auto upshift/downshift) can be altered by some DSG (TCU) tunes.
"Temporary manual mode" is activated by pulling on one of the steering wheel paddles, this only lasts for a short time (I want to say around 10-20 seconds but I've never timed it) and stays in the gear selected unless you pull again on a steering wheel paddle. When the time is up the DSG will revert back to the D or S mode it was in previously. While in this temporary mode kickdown to a lower gear (when you floor the accelerator) will still be active. Normal protective behaviour (auto upshift/downshift) continues to operate.
This explanation my seem a bit complicated, but that is the way the two different manual modes operate. Try it out with your car and it should make more sense.
2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
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