How to remove RSS ext in furls?

<IfModule mod_security.c>
# Turn the filtering engine Off
SecFilterEngine Off
</IfModule>

<IfModule mod_suphp.c>
  suPHP_ConfigPath /home/hotbutto/public_html
  <Files php.ini>
    order allow,deny
    deny from all
  </Files>
</IfModule>


RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www.makethemclick.com.au [NC]
RewriteRule ^(.*)$ http://makethemclick.com.au/$1 [L,R=301]

RewriteCond %{HTTP_HOST} ^www.makethemclick.biz [NC]
RewriteRule ^(.*)$ http://makethemclick.com.au/$1 [L,R=301]



RewriteCond %{HTTP_HOST} ^www.makethemclick.net [NC]
RewriteRule ^(.*)$ http://makethemclick.com.au/$1 [L,R=301]

RewriteCond %{HTTP_HOST} ^makethemclick.net [NC]
RewriteRule ^(.*)$ http://makethemclick.com.au/$1 [L,R=301]

RewriteCond %{HTTP_HOST} ^makethemclick.com.au/index [NC]
RewriteRule ^(.*)$ http://makethemclick.com.au/$1 [L,R=301]


#remove trailing slashes
RewriteCond %{HTTP_HOST} !^\.makethemclick\.com.au$ [NC]
RewriteRule ^(.+)/$ http://%{HTTP_HOST}/$1 [R=301,L]


# Friendly URLs
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?q=$1 [L,QSA]



# Additional Settings Follow
ExpiresActive On
ExpiresByType image/gif A2592000
ExpiresByType image/jpeg A2592000
ExpiresByType image/png A2592000
BrowserMatch "MSIE" brokenvary=1
BrowserMatch "Mozilla/4.[0-9]{2}" brokenvary=1
BrowserMatch "Opera" !brokenvary
SetEnvIf brokenvary 1 force-no-vary

RewriteRule ^(.*)\$ index.php?q=$1.xml [L,QSA]