Custom Authentication in Reporting Services for mobile apps

Hello everybody.

It looks like forms authentification is still not working with the mobile apps

But forms seems to be just one of the variants

Authentication in Reporting Services

there are many techniques that you can use to authenticate a user. The most common way is to use passwords. When you implement Forms Authentication, for example


so more general question:

is there a way to implement Custom Authentication in Reporting Services in order to use mobile apps with SSRS?