Need plugin alter Save behavior

How difficult would it be to create a plugin that would provide the ability to alter the return URL upon saving a record in the Admin section?  Ideally, the URL would return to the address from whence it was called.  I could then call the CMSB update procedure from a list page (membership protected) on the front end and have it return upon save.  I can use the edit procedure now, but it returns to the CMSB list page instead of the page I called it from.