It would be useful if MuseScore had a "Paint Format" button as, for example, found in MS Word and Excel.
The idea would be (as in those other apps) the user would select an element in the score, click the Format Paint button and then click on another element of the same type to replicate the formatting of the first selected element to the second. The button would then revert to its off state and so it would be a "once only" operation. Unlike Word and Excel, MuseScore has objects with differing formatting characteristics. Therefore the proposed function should only operate on elements of similar type - pasting the format from a slur to an accidental would not be allowed. The main use case that I foresee would be to duplicate the formatting of text items and perhaps as a first step, its use should be restricted to text items.