Hi,
I have published the last version of "Apache Mobile Filter", this open source project has in the first 8 months, more than 1100 downloads from sourceforge and I suppose the same from CPAN.

The Apache Mobile Filter allows you to access WURFL from any programming language, not just Java and php that is traditionally used for dynamic mobile web sites.

The module detects the mobile device and passes the WURFL...

HI,
in my experience (10 years) I never had problem with any type of login with any type of devices.
The only problem than I have had was for the https connections with manage the certification authority.
So your problem is only a domain problem to set correctly on the cookie, and I think with some more attempts you will have the solution.
Good luck