Thanks to the recently released Naomi Library, were able to complete my short side project on restoring / improving hidden Debug Menu in Dead or Alive 2 (Jan 27, 2000 prototype), which is really awesome.
Oh yeah, it does work on Dreamcast!
You can download the patch here (use it with Xdelta patcher )
Special thanks to Cyothevile for Naomi Library SDK release, Esppiral and Mallon for beta-testing!