z720

A basic default category plugin. 
The main purpose of this plugin is to provide different default categories on a per user basis.
I was looking for a plugin to set a different default category for my flickr posts (through XMLRPC API). 
And there was no built-in function to set a default category to a particular user.
This plugin is very simple :
<ul>
<li>any author can set it’s own default category (user can <code>edit_posts</code>)</li>
<li>any admin can modify an author default category (user can <code>edit_user</code>)</li>
<li>anywhere in WordPress a user get it’s default category where applicable : posts, API posts, … except in the writing settings page</li>
</ul>

Author Default Category

Any author (user can edit posts) can set its own default category on his profil page.

brainvireinfo

You can now disable XML-RPC to avoid Brute force attack for given IPs or can even enable access for some IPs. XML-RPC on WordPress is actually an API that gives developers who build mobile apps, desktop apps and other services, the ability to talk to a WordPress site. The XML-RPC API that WordPress provides gives developers, a way to write applications (for you) that can do many of the things that you can do when logged into WordPress via the web interface.
<h4>Features</h4>
Block XML-RPC by following way.
<ul>
<li>Disable pingback.ping, pingback.extensions.getPingbacks and Unset X-Pingback from HTTP headers, that will block bots to access specified method.</li>
<li>Disable/Block XML-RPC for all users.</li>
</ul>

Manage XML-RPC

Enable/Disable XML-RPC for all or based on IP list, also you can control pingback and Unset X-Pingback from HTTP headers.

Author Default Category vs Manage XML-RPC