@mike, this is tricky. You see, I didn’t do the Javascript for the actual imagemap creation, this is a JS library done by Adam Maschek — the imgmap Javascript library. Adam hasn’t updated it since July 2009. I’ve just wrapped it around into a WordPress plugin, changing Adam’s code is beyond my abilities.
What I usually do is just to copy & paste the existing imagemap coords into the appropriate boxes (they’re manually editable) at the top. Yes, I know it’s a pain, and it takes a lot of time if you have a HUGE imagemap, but at least you don’t need to configure it again from scratch!
@bluelemonade, a link to a page is just a normal URL. Use direct=1 and on the URL specify things like:
https://my.site.address/my-page1-slug
https://my.site.address/my-page2-slug
etc.
or, if you really really want to do page ids, you can always use
https://my.site.address/?p=your_page_id (ugly, but at least it should survive any permalink/slug changes)
Although maybe I don’t understand quite what you wish to do…