On the grounds that if I ask for something I invariably find that it’s already available…
There a great deal of customisation for tempo and other messages in the Engrave menu, but I can’t seem to find the one I’m after - to position the message between the piano staves and change the font setting (it’s invariably italic). The attached example gives an indication of such messages.
While I’m at it, are braces that tie different lyrics together (also in the example), and lyrics that lie halfway between two sets (i.e. at position 1.5) available?