Rosegarden also allows you to change various aspects of the way the various types of notes are drawn, such as the choice of note heads, the number of tails, whether notes are filled or unfilled and so on.
A set of standard styles (Classical, Cross, Triangle and Mensural) is provided, and you can change the style used for individual notes by selecting them and then using the Note Style menu options. Each note remembers which style has been chosen for it, and this information is saved as part of the composition. You can also change the default style for new notes using the option in the menu.
It is also possible to create your own note styles by describing them in XML files. (Even the standard styles are defined this way: the only reason the editor knows that a Classical semiquaver has a tilted oval filled head, a stem, two flags, etc., is that the description in Classical.xml says so.) See Customising Rosegarden for more information.