Suggestion: add action hook before admin menu nav in the sidebar

[umagrama]

To increase customizability in the admin sidebar menu, I added an action hook in the file wp-admin/menu-header.php. I needed this to implement a menu with the company logo, user avatar , username, some_meta_data, logout link. I removed the top horizontal menu for some user roles. It looks nice and this was the only way I managed to do it without using javascript. Using CSS I change the company logo to a small version of it when the menu is minimized.

wp-admin/menu-header.php

...
<div id="adminmenuwrap">
	<?php do_action('do_custom_before_admin_menu');?>
<ul id="adminmenu">
...

First time creating a ticket here, sorry if something is wrong.