Is it possible to add other values to the parameters when linking to a file other than the ones offered in the drop down.
I have an interactive learning resource that filters the resource depending of what the parameter "qu" is set to (using GET).
file.html will ask random questions.
file.html?qu=+ will only ask questions on addition.
file.html?qu=- will only ask questions on subtraction.
I can see how to enter a parameter called qu but not how to set the value to +