Text type addition

Wish to add a text type to advise which manual to use for an Pipe Organ piece. Options are "Swell", "Great", "Solo", "Choir", "Positive", and possibly manual numbers in roman (I, II, III, IV).
Also a bracket to advise which parts or staves are included in a manual change ( see attached screen dump for example from a Breitkopf und Haertel organ score.)