Is it possible to add a default URL parameter inside a theme template_XYZ function? I have a view with a pulldown menu within an exposed form. I want to set that URL parameter to a default value based on the currentLanguage() of the session. Is there a way to edit the URL parameters that a View can see within a custom module or the theme's template_ functions?
Within a custom module, it is possible to use the hook_views_pre_view hook. You can alter the $args array passed as parameter, in order to add or remove arguments.