OK here it is, I will make a proper post in the Downloads section later if it's decided it's worth doing, tested by me and one other in two different areas as working with DVB-C only setup - How it's done it's possible for me to make updates without the user doing anything (I update the file on the server which is downloaded each time before being ran) so give it a try, if it all works great, if it doesn't then let me know what doesn't and we can look into it together.... As I say just meant as a temp. solution for now, so it's a little crude but does appear to work!
Make a fresh scan with AutoBouquetsMaker so you have a 'clean' channel list (in case you've already tried manual modifications etc.) then just run the plugin and it will do the rest resulting in a GUI restart (takes seconds actually) then hopefully when it boots back up it will now have required audio options. I have included all pids that were available at the time where possible, mpegvideo, mpegaudio, teletext (subtitles), AC3 etc.