It would be useful to be able to trigger script or executable class actions on various form input components. It would be useful to be able to trigger an onClick script for CMS_INPUT_CHECKBOX, CMS_INPUT_COMBOBOX, CMS_INPUT_RADIOBUTTON and CMS_INPUT_TOGGLE.
Additional events, like onChange, onValid, onInvalid, may also be useful.
Alternatively, allowing RULES to trigger scripts in the <DO/> clause to achieve a similar effect.
A script could create a new Section, pre-populate several form fields, create tasks for users, or display messages more sophisticated than <VALIDATION/> rules can show.