Apparently, you can add alot of notation, but it won't actually play it. You can have the program draw crescendos every which way, but it'll only draw them on the sheet...
I recall seeing a full version or something on the website for it a while ago, which allows you to print off your sheets, so you would have to be able to add a lot of notation for playing in real life. For most notations you can add you can easily do anyway by right clicking the note and choosing properties.