In the version 2.3, the Paragraph palette on the Articles main tab (or when editing text on the Pages main tab) is improved.

Improvements

•The Leading field shows the leading in square parenthesis when the auto-leading is active. On the following screenshot, the auto-leading of 9.6pt is active.

•In the Leading field, you can enter the leading in percentage:

•On pressing the RETURN key, the field is updated with the appropriate value.

Preference

The new preference Auto leading % is available on the Main tab of the Text Editing Preferences. Tick it to enable the automatic insertion of the auto-leading tag when changing the type size. Set the percentage to what you want, from 0% to 500%.