We have disabled 2D acceleration a long time ago because it makes things slower on “modern” hardware (anything using PCI or AGP). And for PCI-express most cards don’t even support it, because you can do things better and faster with the 3D acceleration (2D is just a special case of 3D now).
Only the hardware accelerated cursor is still supported, I do plan to have a look at that but it isn’t that great of a feature so I worked on other things so far.