Problems with certain chord names

[Andre Schnoor]

Hi all,

I'm new to this list and am currently implementing LilyPond export for 
my software "Music Prototyping Studio". First of all I'd like to thank 
the makers of LilyPond for this great and exceptional product!

Most export algorithms of my program already work fine and the resulting 
scores rendered by LilyPond really look exceptionally fine. However, I 
seem to have problems with the following chord names:

   (add2)         = "2" ?
   (add4)         = "4"
   6(add4)       = "4.6"
   m7(sus4)      = "m7sus4"  (rendered as "7sus4")
   maj7(add4)   = "maj.4"   ?
   7(b9,#9)      = doesn't work because 9th is occurring twice

I could not seem to find any working LilyPond spelling for them. Did I 
miss something? Where can I find the latest complete list of supported 
chord names?

Thanks in advance,
Andre