I have all of the Denon documented AVR codes in an excel
format for quick cut and paste. It is a beta version.
They work for the 5806, 4806, 4306, 3806, 2807, 1905 and
others. I do not have them in the RTI library yet but
I imagine you only need the 4306 specific codes (iPod,
USB, Net etc...). All the 3806 codes found in the master
library work for the 4306. I can email the file.

About the file... using make hex, I generated all of the
sharp and most of the possible Kaseikyo codes using the
device numbers applicable to Denon AVRs. I organized them
in worksheets by make hex device number and documented
the applicable codes in pronto hex and their function
names. There are many unused codes but I figured that
they could be filled in as new ones came down the pipe
and I expect a number of new codes with their next releases.
I bent more than one ear at Denon about iPod, USB and
Net control from zone 2/3.

The codes you may need are can be found on the Denon-K
4.1 page.