What you need to do is create a new wp_xmlrpc_server class and apply it using a hook
<strong style="font-family:'Times New Roman';text-align:justify;background-color:rgb(255,255,255);font-size:medium">wp_xmlrpc_server_class.</strong><div><br></div><div>The new class will be as the same as the old class except you must hack the login method (line 179)</div>
<div>and remove the code segment which checks whether the xmlrpc services are enabled.</div><div>(From line 180 to 184) <br><br><div class="gmail_quote">On Mon, Jan 9, 2012 at 1:30 PM, Ryan Chan <span dir="ltr"><<a href="mailto:ryanchan404@gmail.com">ryanchan404@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I want to turn on XMLRPC for users' blog without the need to change<br>
the setting in their wordpress's admin.<br>
<br>
Is it possible to say, create a new file xmlrpc2.php and copy this<br>
file to under the user's blog and apply some hack in this file to by<br>
pass the admin setting?<br>
<br>
If yes, which file I should look at?<br>
<br>
Thanks.<br>
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</blockquote></div><br></div>