A better way to create custom FCKConfig vars?

I wanted to create a custom FCKConfig variable to define a specialised path I was using in a plugin. This was so I could define the path when I created the editor and then use it in the plugin. I found one way of doing this (courtesy of a post whose author I can't remember), which is:

When declaring FCKeditor:

<cfscript>
//usual initiating vars

fckEditor.myVar = 'myvalue';

//rest of usual initiation
</cfscript>

Then in the fckeditor.cfc:

Where the other CFPARAMs get initiated:

<cfparam name='this.myVar' default=''>

Then where the sURL value is set (around line 154 in the cfc):

sURL = this.basePath & "editor/fckeditor.html?InstanceName=" & this.instanceName;

Add myVar to the URL:

sURL = this.basePath & "editor/fckeditor.html?InstanceName=" & this.instanceName & 'myVar=' & this.myVar;

Now on fckconfig.js add:

FCKConfig.myVar = FCKURLParams['myVar'];

This seemed to work OK - however it seems to be quite a round-about route (also, I don't know if there is a limit to the length you can make that sURL value either, so it may only take a few vars) to add a custom FCKConfig var - is there an easier way?

Or a completely obvious way of achieving the same thing that I've missed?