inner

<ul>
<li>English</li>
</ul>
This plugin convert to lowercase messages written completely in UPPERCASE
<ul>
<li>Espa?ol</li>
</ul>
Este plugin transforma a minusculas los comentarios enviados al blog que han sido escritos ENTERAMENTE en mayusculas.
<h3>Arbitrary section</h3>
<ul>
<li>English</li>
</ul>
In line number 13, You can set a warning message. It will appear below user’s comment.
If you don’t want any warning message to be appended, just set
define (“mensaje”, “”);
In line number 15, You can set the minimum number of message characters required for conversion
define (“minimo_caracteres”, “6”);
If You want to change fullLower function acording to your language, Visit this thread
http://es.php.net/strtolower
<ul>
<li>Espa?ol</li>
</ul>
En la linea numero 15 se establece el minimo numero de caracteres que ha de tener un mensaje para ser transformado. Establecido en 6. No se transformaran expresiones como “JODER”
define (“minimo_caracteres”, “6”);
En la linea numero 13 se establece la nota de aviso para el lector que aparecera en el cuerpo del mensaje. 
Si no deseas que aparezca ningun aviso, deja la linea de esta manera: define (“mensaje”, “”);
Otra opcion para que no aparezca ningun aviso consiste en borrar la linea n? 13 y borrar tambien la linea numero 36 ($devolver .= mensaje;)
NOTA: Los caracteres con tildes y otros como la ? quedaran en may?sculas tras las transformacion.
Puedes dejar tus comentarios en este hilo
http://blog.innerpendejo.net/2008/11/plugin-de-wordpress-para-pasar-a-minusculas-los-mensajes-escritos-enteramente-en-mayusculas.html
No obstante, dudo que realice modificaciones a peticion.

Mata Mayusculas – Kill Caps Lock

Giorgos Sarigiannidis

Remove Uppercase Accents is a WordPress plugin that automatically removes accented characters (currently greek) from elements having their text content uppercase transformed through CSS ( with <code>{ text-transform: uppercase; }</code> ). Currently the script transforms only greek text, but it can be easily extended to support other languages.
Why you would need this: For example, in greek there are accent marks that denote in which syllable you put the stress on when pronouncing a word. However, when words are written in all UPPERCASE, those accent marks are removed. This rule is not followed by the aforementioned CSS rules, as they just use the corresponding uppercase unicode character.
<h4>Features</h4>
<ul>
<li>Automatically removes accented characters from text content uppercase transformed through CSS.</li>
</ul>

Remove Uppercase Accents

Great plugin with a lot of options and extendable!
Great work!

Congrats

Automatically removes accented characters from text content uppercase transformed through CSS.

Mata Mayusculas – Kill Caps Lock vs Remove Uppercase Accents