Hi,
interesting.
You have another problem as you mention EU countries. The EU cookie
regulation.
On what version are you? 2.5 latest?
I made some tests to get rid of the language cookie a while ago and only
by hacking the platform core it was possible. I think all is now in the
plug-in but I'm not sure. i.e a fork of the languagefilter should work
(as long as you don't use the language switcher module) Since there is
now at least one woking solution available to block all cookies
(including the session cookie), this problem is solved. To my surprise
the language switcher worked without the language cookie. I suppose
because of the language code in the uri!
If a "mylanguagefilter" is not possible and your customer do not care
about this EU regulation it might work if you set this cookie with a
plug in before the languagefilter is loaded I'm really not sure!
Ove