Thanks folks...much appreciated.
Can recall at a previous company that operated wide-body three engine jets, the use of reverse (with one locked out) was not restricted at all...until the respective fleet manager got rather off to the side/end of the runway (and in the dirt) one day and then, just for a good show, tried to get back onto the runway using full reverse (on two) with spectacular results. The tower supervisor told me later that the huge dust cloud could be seen for miles.