by Iñaki Arenaza.
Humm, this is a tricky question. Without having a thorough look at the code I'd say it might work (the module "API" hasn't changed, and the implementation should be self-contained). You might get some trouble from the CAS plugin (as it's a subclass of LDAP plugin in 2.x, but a completely independent class in 1.x), but again I haven't checked it thoroughly.
Saludos. Iñaki.