create a URL Binding for each drop down.
go to the bindings panel and click the plus button, and select URL Variable. set the name to "security" for the Security dropdown, or "environment" for the environment dropdown,, etc.
then in design view, select each list, in the property inspector, click the dynamic button. For the Select Value Equal to option, click the lightning bolt icon and select the corresponding URL Variable binding.
regarding the value in the URL, no this cannot be changed without breaking the search.