Hi Umbracians!

I'm using Umbraco 4.5.1 at the moment and stumbled upon this (for us) unwanted behavior:

In the BeginRequest event I'm changing the CurrentThread.CurrentCulture property by reading a 'culture' cookie.
Then in the OnInit of the masterpage or a usercontrol the culture has been overwritten by Umbraco.
Just took a look in the source and found out that in 'Default.aspx' the culture is overwritten if Domains are set (Domain - Culture combination):

Snippet

string tempCulture = m_umbPage.GetCulture();
if (tempCulture != "")
{
    System.Web.HttpContext.Current.Trace.Write("default.aspx", "Culture changed to " + tempCulture);
    System.Threading.Thread.CurrentThread.CurrentCulture =
        System.Globalization.CultureInfo.CreateSpecificCulture(tempCulture);
    System.Threading.Thread.CurrentThread.CurrentUICulture = System.Threading.Thread.CurrentThread.CurrentCulture;
}

Now for us this is unwanted behavior, there should be an extra check in the if statement for an appSetting or something like that (so you can disable this from the web.config).

Now I fixed it by creating our own Default.aspx, which inherits from "umbraco.UmbracoDefault" and add this code:

Snippet

public partial class Default : umbraco.UmbracoDefault
{
 protected override void OnPreInit(EventArgs e)
 {
     base.OnPreInit(e);
 
       SetCulture();
 }
 
  void SetCulture()
  {
     try
     {
         CultureInfo culture;
 
         // Set culture
           HttpCookie objCookie = HttpContext.Current.Request.Cookies["culture"];
          if (objCookie != null && !string.IsNullOrEmpty(objCookie.Value))
               culture = new CultureInfo(objCookie.Value);
         else
                culture = new CultureInfo(UmbracoExtensions.DefaultMLLanguage);
 
         System.Threading.Thread.CurrentThread.CurrentCulture = System.Threading.Thread.CurrentThread.CurrentUICulture = culture;
 
         System.Web.HttpContext.Current.Trace.Write("HttpModule.cs", "Culture changed to " + culture.TwoLetterISOLanguageName);
       }
     catch (Exception ex)
     {
         Log.Add(LogTypes.Error, -1, string.Format("BeginRequest exception: {0}", ex.Message));
#if DEBUG
            System.Diagnostics.Trace.TraceError("BeginRequest exception: {0}", ex.Message);
#endif
        }
 }
}

So the questions are:
Why is Umbraco always overwriting the CurrentCulture, while in some situations this is unwanted?
Why isn't there an appSetting which can disable this?
And will there be an appSetting in the future for this?