Q: How can I specify different symbols and rotation angles for different classes of points for a point layer?

A: You can achieve the effect through custom thematic maps. While creating thematic maps, symbols from the symbol library can be read only if symbols IDs are stored in the field for thematic map generation. It is similar for rotation angles. You can store rotation angles for different points with a field. One point to notice is that fields used for custom fields should be of the numeric type.