hdcms Hi
Please refer again to my reply through which I had precisely tried addressing your specific queries.
a) The method as outlined by @teitbite is present in the trailing forum post based upon which favicon from local folder is reflecting.
Kindly refer to the blog post - Isolate Template Settings and Customization once again from which certain excerpt is being quoted again for reference -
The new feature will help you keep your template settings and configuration intact even when you upgrade for a new version. In short, this feature will make your template settings and customization stay the same when upgrading your site.
so the specific settings or customizations wont get overridden whilst doing upgrades.
Nevertheless, It is always suggested to always take backup of your site before performing updates, in case rollback required whilst facing any issues e.t.c
2) This isolation feature for favicon isnt added by default however, we would plan to instead add the instructions in T3 framework documentation which would come handy for all templates powered by T3 framework and would be globally adaptable enabling users to successfully accomplish the specific task on JA templates powered by T3 framework
Hope this helps 🙂