Lost all night searching for something like this. Thought it wouldn't suit me, but it did. Because, actualy, you can completely change text after question mark.
Complete customization? YES!
Any plugin that forces you to use a particular pattern (ahem, like ?token=...) defeats the purpose. I would never accept that someone else knew any part of my security codes - and I would never want to know (or define) any part of yours.
I'm glad that it does suit your needs, and you're welcome!