Let me elaborate a bit on why you can't add queryStrings to the additional url itself. The reason for this lay in the fact that each url in Sitefinity consists of segments. Adding a queryString to the url would lead to problems with multilingual for example, because the url would not be sonstructed properly.
What we sugest for your case would be to use IIS rewriter. Another powerful rewriter, used by many of our clients is the open source UrlRewriter. They will allow you to declare specific rules, that suit your old urls.
the Telerik team
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