Featue request – pinned favorite backend link

You are welcome to post such ideas in Core Trac, where developers can evaluate and respond: https://core.trac.wordpress.org

However, the admin UI will be revised this year anyway, and something like this may already be part of the planning for the new view.

And of course you can also implement your wish as an individual plugin. Plugins like https://wordpress.org/plugins/admin-menu-editor/ already enable individual customization.