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As you said, stcrim - if it's not straight html don't count on it. - that's probably the best bet for now. I searched for a bunch of diferent things, and didn't see one ? page.
This is my understanding as well.
The problem isn't actually that it can't index pages which contain the ? character, but that it can't crawl links to dynamic pages, or pages created on the fly.
When a spider gets to such a page, it can't follow the links because ahead of it, it sees an infinite number of pages. This is assessed as a "black hole" which would cause it to crash.
Remember, too, that a spider doesn't know how to fill out a form.
We have hundreds of these pages indexed, both via PT and via the "old" free route, and they have always done well.