Mark Jaquith

<ol>
<li>Check a category.</li>
<li>Uncheck “Uncategorized”.</li>
<li>Mutter “stupid ‘Uncategorized'” under your breath.</li>
</ol>
<p>Sound familiar? With this stupidly simple plugin, you just have to do the first step. When you check a category and the default category was the only thing checked before you clicked, it’ll uncheck the default category for you. Boom.</p>


Categorized

Unchecks the default post category when you first select a non-default category

Clement Decou

<p>Search dynamically a category in the box/block category in admin</p>


WP search category admin

Add a search input into a Post edit Page to add fast category for a Post and in quick edit.

Categorized vs WP search category admin