>>>>> BMA DC-9's used to do quite often on to the bravo cul de sac at Terminal one LHR in the 1970's and 80's <<<<<
Apart from maybe one smartarse, no they didn't, and even then it was shutting down just as brakes were applied for final stop……..never "coasting".
……..and reversing off stand was forbidden because of ingestion, "bucket" damage and the possibility of lifting the nose wheel off the ground. Did you ever really look at the amount of rubbish on the Bravo stands ?