Hi Lawraence,
The customization through the service only decides what happens when a dirty flag is set- ignore, proceed , or show the popup:
"The portal administrator and the user can customize this behavior in the Service Configuration and Portal Personalization dialogs respectively. It is possible to deactivate the WorkProtect feature completely or display the popup messages so that user can decide how to proceed in each case. For more information, see SAP Note 734861 
."
If you would like to change the popup page (display more/less options) - this requires customization of that popup.
For this check this link:
https://help.sap.com/saphelp_nw73/helpdata/en/37/c7bfd9f77646ddb01d729c8128f809/content.htm
But, you mentioned this was done, and it works well already.
Best Regards,
Tal