I have located the source of most problems with the 3.x clients, including the cliloc spam and several crashing issues. I have also found some solutions, however many of them conflict with some of the features AOS clients offer, which we currently support.
I'm currently investigating a solution that would support 3.x - 5.x clients with AOS features, allowing slow connections to use 3.x clients and ridding us of 3D.
Updates on enable 3.x clients
Updates on enable 3.x clients
Hear it not my lord, for it is a knell. That summons thee to heaven, or to hell.