1) I would like to see the possbility of color-coding the assumed variables (insteas of the ~ postfix or a text). Expressions with a lot of ~ are soon illegible, and anyway cannot be easily published. Color seems an obvious possibility.

2) I would also like to see an "execute worksheet up to cursor" option. This would be useful to test modifications of long worksheets, where performing a manual selection is cumbersome. Such an option is common in debuggers, for instance.