This is way late, and I'm not sure if anyone is still reading comments (and perhaps I missed this in another post), but one important thing about beaming comes in tremolo notation – specifically, slashes through the stem, of beam thickness. In many editions, tremolo slashes are drawn parallel to the main beam(s) when they occur on beamed notes. Product C does this by default (see my avatar), but neither of the two leading commercial programs is even capable of it without a great deal of heartache. In Behind Bars, Gould suggests that the commercial programs have it correct for current standards and that parallel-to-beam tremolo marks are obsolete. Any thoughts on this? Perhaps incorporate both and let the user choose which style to use?