It could be. However I've tried every trick I can think of, and it doesn't work (it has to be in the top level domain, i.e. facts.wikidot.com/thispage.html instead of in a subdirectory)
If I'm honest, I think Wikidot is great, but this and a couple of other limitations do really restrict the usability of my site, and it's of such a nature, that I'm likely to get a huge amount of bounced hits because of it.
If there would be any way to implement this, I'd be over the moon. Even just a control panel option that lets you create one html page of your chioce would be great.
Of course the other thing I realy want is a "random page" button. If it would be feasable, I'd happily write the code myself and submit it?