the MSW_id value sometimes changes, rendering the GUI map useless

:
MSW_Id's will continue to change as long as your developers are modifying your application. Having dealt with this, I determined that each MSW_Id shifted by the same amount and I was able to modify the entries in the gui map rather easily and continue testing.
Instead of using the MSW_id use the "location". If you use your GUI spy it will give you every detail it can. Then add or remove what you don't want.