The Actions tab contains settings to specify the behavior of the control in Read-write and Read-only modes. PRPC 7.1.9 has applicability as Editable, Read Only and Both. Would you please illustrate it from a use case perspective when it is appropriate to use?
I think the below description may help you to understand the appropriate use-cases.
Before you begin editing the rule, use the radio buttons to filter the initial array of options and parameters in the form. Select one of the following:
Editable/Read-only if you want to configure the associated property for both edit and read-only modes. The options appear in the Basics, Format, Options, and Behaviors areas under Editable and Read-Only column headings. You can configure the following UI Elements:
Rich Text Editor
Read-Only if you want a control that always appears as non-editable text. The Editable column does not appear.
Action to set the UI Element to Button, Icon, or Link. Only one column of settings appears, which applies to both editable and read-only control modes as defined in other parameter settings in this form.