PowerProducer 3.0 OEM and setting Aspect Ratio

I just purchased an LG GSA-H10A that comes with PowerProducer 3.0 OEM.

I use it mainly for burning AVI files to DVD. I can’t seem to find a way to keep the 16:9 aspect ratio when converting and burning. The only way I have been able to do it is to convert the AVI files using Cucusoft and then burn them to DVD using PowerProducer.

Looking for a recommendation of a good/inexpensive software that will allow me to burn multiple AVI files to ad DVD at the same time while maintaining the proper aspect ratio.