Simply do the following:
- Edit the attribute you need to change in a specific schema inside /usr/share/glib-2.0/schemas/[your_schema_name], e.g.
sudo vi /usr/share/glib-2.0/schemas/com.canonical.canonical.indicator.session.gschema.xml
- Change the value you need, in my case I wanted to disable the user-show-menu key, so I changed it from the default value of true to false
- After you’re done, just run:
glib-compile-schemas /usr/share/glib-2.0/schemas
Enjoy!
Sources:
Just Some Techie Notes! 
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