Traditional Notation Duration Symbols
These symbols are unintuitive to read and require a significant amount of learning time to identify and play them with ease. On the other hand, note duration in WYSIWYP is graphic and intuitive because it requires no translation of a symbol to time and can just be seen. In addition, unlike WYSIWYP, Traditional Notation symbols are not fixed in terms of the beat (they are a function of the Time Signature).
There are likely to be some students who decide to learn Traditional Notation after having started out with WYSIWYP. With some confidence in playing music they may then be better able to focus on the complexities of the stem and flag system of note duration. Therefore, to help address the challenge, a new enhancement would be to have a User Preference option of displaying the Traditional symbols instead of the WYSIWYP noteheads. The substitution would remain in place with the notetails still displayed. Another User Preference option would inhibit their display.
Keep in mind that this is intended only as a learning tool and not a full-blown implementation of all the nuances of Traditional Notation's notehead / stem / flag / beam / semi-beam / stem up-down direction / etc. system. It simply gives the student the opportunity to begin to associate the symbols with duration in a relative manner. Thus, this is a basic introduction to the student upon which to build all the complexities of the symbol system.
Here's an example of how a WYSIWYP score would look with Traditional symbols: