This has been brought up a few times.
Original Android development can have both sense roms and non sense roms eg CM, recoveries and kernels. The difference is the OP of the ROM has had to have made a large contribution to make the rom, recovery or kernel different to anything else of its type. This means that there has to be a large number of features that are unique to that rom and not offered in other roms.
Also any builds that go into OAD forums should be official builds by official maintainers as well. All non official builds should be in AD forum.
This would apply to kernels recoveries etc as well.
Edit here is the link to the main page that says what can go in to OAD and what cant: Introducing Original Development Forums for More Devices