Nero Burning Rom is NOT a DVD editing or creation package.
It allows you to make discs with content that has been already made in the correct format (also it allows a few ways to encode some files but not many)
The program you may be looking for is NeroVision Express. This allows you to make DVD's / VCD's etc and choose bit rates and apply menu's etc. Take a look at www.nero.com for further information, or search these forums.