I mean you don't have to open your driver for kms. but you should give us something as useful. maybe most user are not interested in this. But for me it is a valid reason to switch to ATI (as i just read they support kms) after 12 years using nvida. I recommended nvidia to everyone using linux, because i had the feeling that the driver are really ahead. I am not so sure if that is still true. i know that you don't care about single voices. my latest card is a 250 gts so i will keep it for a year or two, but if i am not able to use text mode by that time i'll think twice before buying a nvidia card. I have wasted 10 hours into this and really tried everything and now you really hit my pain limit i am really sick of this
The least you could do is writing a some sort of driver that replaces nvidiafb and does not interfere with the nvidia x driver.