You sure can. Just add the URL as much as it can take, save out of UE and go into code view on the page. You'll find the exact URL string as you entered, and make your edit.
Since Jimmy was not able to reproduce the error, it appears that it's not a limitation of UE. Often DW crashes are a result of a corrupt site cache file. It doesn't sound like it's the same sort of crash, but it's worth a try.