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Such button within components selection web page will help users with quick selection of great number of required components to install.
Fixed. The new version of the page will feature a Select/Unselect All button for the custom column.
I don't think it is really needed to give the option to select/unselect all components. Note that regular user would go through this step once for final release and maybe once for beta release. I also don't think there will be many users who want to unselect all optional components. I suggest don't do it.