As you may have noticed: :)
I'm in the midst of updating the Wireshark dissector sources step by
step to use ENC_NA|ENC_LITTLE_ENDIAN|ENC_BIG_ENDIAN for the "encoding
parameter" of function calls such as proto_tree_add_item() as appropriate.
I'm using a Perl script to make those changes which can be done in an
automated fashion.
(I'm currently learning and adjusting the script as I go).
(To complete the work there will undoubtedly be additional manual
editing of dissectors required).
Once I've gotten to a reasonable stopping point I'll provide a script
which can be used by others (e.g., to convert private dissectors).
Bill