There are no styles applicable to ‘Math’ formulas (to distinguish from the OLE frameshape). If the formatting of formulas in a ‘Writer’ document got inconsistent, it may be very time-consuming to get it harmonized again by editing every single formula and changing the format attributes as needed.
It would be nice to be able to use the format attributes of one of the formulas for all of them, in other words, to use one of the formulas as a kind of template for all of them.
Additional note:
This was a “fake” question insofar that I had in mind to answer it myself from the beginning (apologies to @mariosv).
However, I am intersested in suggestions and alternative solutions. A special aspect should be how to restrict the working to a selection the user made. That’s not difficult in most cases, and I would have implemented it if not the case of a selceted range of a “complex TextTable” (with merging and/or splitting) had been so unhandy.