It would be great if we could duplicate App Specific settings and assign them to a new app. Or use an existing App settings as a template when creating new App specific settings.

There are (at least) two user cases for this.
Sometimes Options + does not recognize new versions of the apps as their exe file name has changed. So instead of creating a new app specific settings, and setting again every setting, it would be nice to copy the old settings and assign them to the newer version.

Other user case is when there are similar applications, like different browsers, and you like to have similar settings for them. So instead of making the same settings 2 or 3 times, you could just copy those settings to a new App.

Other solution for this could be that same settings “profile” could be used for multiple apps. Like you could use same settings for Edge, Opera, and Firefox. But also then it would be useful to be able to copy those profiles to use them as template for new profiles.