Here's a full list after jumping through decompiled code:
Code:
C/67: weapon-related
I/73: something with weapons
I/73: ammo/weapon/health pickup
J/74: ?? something in dropclient
a/97: weapon-related
b/98: not a clue
c/99: inactivedropwarning/not a clue
d/100: setconfigstring
e/101: iprintln
f/102: pickup ammo msg/weapon related
h/104: say backend
i/105: not a clue
w/119: something in dropclient/shutdownserver. Might drop the client in question
x/120: longer setconfigstring, %c %i %s, might be i = total amount of strings to follow, with 121 being an intermediate thing, and 122 being the final one?
y/121: same as above
z/122: same as above