asp.net: setting multiple css in web.config

I try setting multiple css in web.config of asp.net

<appSettings>
..
    <add key="FCKeditor:EditorAreaCSS" value="/css/test.css" />   
  </appSettings>

But it not working.

Next code work only if where in only one css in EditorAreaCSS property:

<FCKeditorV2:FCKeditor ID="bodyFCKeditor1" runat="server" Height="500px" Value='' Width="700px" EditorAreaCSS="/css/styles.css, /css/test.css" >

This is working variant, that i whrite in fckeditor/fckconfig.js:

FCKConfig.EditorAreaCSS = new Array ('/css/test.css','/css/styles.css') ;

I read this:

http://dev.fckeditor.net/ticket/794

And make patch

https://sourceforge.net/tracker/index.p ... tid=543655

But not understand: are setting multiple css is available only in the configuration file fckeditor/fckconfig.js ?
Are exists other ways to set it?