ASP.NET MVC2 Authentication form with localization - asp.net-mvc-2

Question

I have two level authentification, first the user enters their nt/password and it is validated by LDAP and afterward I have a custom role provider that make sure the user has access to said page.
That being said, in my web.config I have:
<authentication mode="Forms">
<forms loginUrl="~/Account.mvc/LogOn" timeout="2880"/>
</authentication>
<authorization>
<deny users="?"/>
</authorization>
<membership defaultProvider="ADMembershipProvider">
<providers>
<add connectionStringName="ADConnString"
name="ADMembershipProvider"
type="System.Web.Security.ActiveDirectoryMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
attributeMapUsername="sAMAccountName"
enableSearchMethods="false"
applicationName="ProgramName"/>
</providers>
</membership>
<roleManager enabled="true" defaultProvider="CustomRoleProvider">
<providers>
<clear />
<add name="CustomRoleProvider"
applicationName="ProgramName"
type="ProgramName.Providers.CustomRoleProvider"
attributeMapUsername="sAMAccountName"
/>
</providers>
</roleManager>
Now, If I try to use the language button while in the login form, it calls an action that is unavailable since the user still isn't LDAP-Authenticated. My question is:
Can I avoid the membership check for specific action like I can for role check using the [Authorize] Attribute?
I tried using:
<location path="~/Home.mvc/ChangeCulture">
<system.web>
<authorization>
<allow users="*"/>
</authorization>
</system.web>
</location>
And this doesn't work. The action ChangeCulture is never called.
This answer:
ASP.NET MVC Forms authentication and unauthenticated controller actions
shows how to do it for roles, any idea for membership+roles?
Thanks.