1. Replace backspace by the conjugate operator.
2. Plot: conserve points/lines, remove others
...add Smath 3D, Maxima X_Y ,,, maybe plotG(,)
3. The range Summation is desirable
4. The vector Sum is desirable.
5. Undefined integrator is desirable
6. 'n' derivative is desirable.
7. if/else, if/otherwise
[some maths don't accept if/otherwise]

==============================================

8. Insert Image
9. Insert Writer region
10. Insert Area/Separator

Few more work sheet functionalities ?
1. Shift, click on sparse regions to select
2.
3.

Enhancing Smath is another story.