Speedloading with selfbootable DC games!!!

Some games are really slow like crazy taxi and snow surfers, but if you make them speedloading it really makes a big difference.
But these game were not selfbootable and were easy to remake.
Image with Cdrwin and then da.exe (dummyadd) burn it again and it was done. But now I have some games that I want to do that are selfbootable. I can't find how to do them. Please help?
And one more thing, dummyad only makes images of maximum 80min but 90min would be even better. How can I do that?
Thank you in advance!