I never use DVD9 with this software, because I've never once gotten it to burn successfully. It's made a few coasters, but never a DVD9 I could play in a set top DVD player.
This may be because I'm using an external Sony DRX-820U burner. Yesterday, I ordered a pair of Sumsung IDE burners, and I'm hoping things go better with those.
I use other software (CDBurnerXP) to burn DVD9 data discs, but never movies. I've tried ImgBurn, and that's never worked, either.