Allow figured bass directly on selected rest (in bass line)
It is possible to place figures (as in figured bass) on a rest by navigating from the figure (even a null one) on the previous note, either by typing a note-value number (e.g., Ctrl-4 for an eighth note since the last) or by simply typing space inside the figure of the last figure--- remarkably, MS just positions to the rest with the figure open.
There seems to be no reason, therefore, that you cannot simply type Ctrl-G at a selected rest.
There are two reasons for figured rests, (1), the common one, a change of chord from the last bass, as opposed to releasing the realization, and (2) in certain pieces, a chord that starts before the bass note appears (see Bach example in linked postings). In the latter case, the first rest of a composition starting with a rest cannot now be figured (because there is no last note to navigate forward from).