I think that the user interface is easy enough for highschool students. You can test it now with the original version non Moodle aware.
It support flowchart call: higher level flowchart can call lower levels one.
But the drawing capabilities is limited to "program flowcharts". You can't add new symbols without modifying the visual basic interface.
It is good to want to give to the students a "feeling" of the decision-space in hidden decision-trees like in lesson. The flowchart representation is good for that but I think it will be more easy to use a tool like JpGraph to handle only the representation of the flowchart.
The visual basic tool support also the editing part, the linking of elements and the interpretation of the flowchart ( most complicated part of the software).
p.s. You may be interested by Regulates the rights for groups in a course:
General developer forum
Flowcharting tool: Any interest?
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