I needed to add the ability to burn aac files (.m4a) as audio tracks in NeroLinux. I knew you could add additional filters, but the docs are a little light. Download the pdf from Nero's site, they are better than nothing. Below are the settings I used (in each edit field):
faad -w "$file"
faad -i "$file"
(getpos(15, 1) * 75) * 2354
This will allow NeroLinux to decode the aac on the fly and create valid audio cd tracks.