In this tutorial, I am going to show you how to disable that Get parameter for all clients on your host. They can change it if they want to (if only you could put permissions on files that clients are given )
Go to the RESELLER PANEL
Login with your credentials
Go to Customizations > Default .htaccess
Paste this code and submit (Thanks @xpde)
RewriteEngine On
RewriteCond %{QUERY_STRING} .
RewriteRule ^([^.]*)$ /$1? [L,NE,R=301]
Now your clients can use ads or something on there websites without getting a weird ?i= in the URL bar to mess up there profits.
Credits to @xpde