Hi @ConsciousApps, as @Waldo mentioned, the ability to use query string parameters is not yet supported, but this is already on the wish list here http://forum.webflow.com/t/ability-to-add-301-or-302-redirects-to-urls-with-querystring-parameters/23411
I hope this helps. I can understand that this would be useful. When there is an update to the wish list item, it will be announced.