place them manually on your iDisk but in the Sites folder instead of the Web/Sites folder which is where iWeb publishes
I disgree
You can put any webpage created with any Application you like in the iDisk/Web/Sites folder.
Besides iWeb, I use Contribute/Dreamweaver and Sandvox (demo) as these can publish to any folder on iDisk with WebDav.
The latest version of RapidWeaver (4.0) can now publish to the iWeb folder too.
And simply copying webpages and folders to iDisk works equally well.
Using WebDav you create a link to the folder:
http://idisk.me.com/UserID/Web/Sites/foldername/
The folder has to be there. You can also set up a local/network connection. See blog entry below.
When you do local/network then you can mount any iDisk folder on your desktop.
Here's my blog entry of a similar setup using Thingamablog. (Translation is by Google)
[THINGAMABLOG CONNECT WITH IDISK|http://translate.google.com/translate?u=http%3A%2F%2Fwww.wyodor.net%2Fblo g%2Farchives%2F2008%2F08%2Fentry_38.html&hl=nl&ie=UTF-8&sl=nl&tl=en]