First a kudo for a beautyfull designed application.
I am a parent to an 11 year old kid finding algebra with pencil and paper fun.But he dont like calculators,and find mathcad 2001i too owerwhelming,which is natural.
I read a discussion about marketing new software in the "project" thread on SMath site where a professional salesperson stated new / different features from competitors was an advantage in capturing users from the market.
I know mathcad 2001i is used widely in 10-12 grade in northern europe,also in UK Open University etc..
With the possibility for a teacher to customise a (simplified) toolbox for f.ex. school algebra the pupil would not be frightened by too many unknown symbols,and could find first steps in computer math rewarding and giving sense of pride when pressing "print".
Following year the teacher could expand toolbox with tools to be used that year.
I wish you good luck,and a bright future for SMath