I want to use a Left-column block as a menu - to change what blocks are displayed on the Center column - and I'm thinking I could do this by creating different (empty) Pages, adding each one as a Custom Action, then assigning my different blocks to be Visible only on the desired Pages.
One problem is that it doesn't work.

I've added a Page (visible only to the Admin), then added its URL as a Custom Action for ezBlocks, then added an ezBlock that's only Visible on that Page-Action, yet when I visit the Page URL the ezBlock doesn't show.
The second problem is that now I can't delete the new Custom Action. While the corresponding Page existed, the [delete] link just took me to the Administration homepage without deleting it. Now that I've removed the Page the [delete] link takes me to an error page saying that the Page doesn't exist. And I can't re-create it either, because the numbers at the end of the URLs of any new Pages I create keep being incremented and I'll never get "p=2" again.

I'll probably have to go in manually somewhere to get rid of this. Where are the Custom Actions stored?
Thanks.