To: mike.maloney63@gmail.com
Hello,
DVD video is standard definition video, so you will certainly loose the quality converting HD files to DVD.
Advanced setting are not availabel as DVD video must have standard properties to be played on DVD player. There are 4 standard quality presets - High Quality, Good Quality, Standard Play and Long Play.
The option to change Aspect Ratio is available on Timeline, please find the details
here. I suppose your m2ts files have 16x9 aspect ratio, so you should select the same in the project.
I hope it helps.
Best regards.