I would actually love to see the not as know, but more common MG's of the Jap army.
Like the MG that holds 6 stripper clips.
That would be the Type-11.
YouTube - Japanese Guns of WWII (3)
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Go to 4:30
In fact, that whole video series is a good one, although sometimes they're a bit overcritical IMO.
Anyway, the IJA HMG's could simply be stationary weapons, like AT guns in RO:OF. In real life it takes a crew of 2 to operate one and a crew of 4 to move it around. Obviously this thing isn't going to be going anywhere.
For the sake of gameplay the IJA AT-rifle penetration values may have to get juggled. If RO were absolutely realistic to begin with the Russian AT rifle would be worthless.
Anyway, here's what I [may] expect to see for the IJA side:
Type-38 rifle
Type-38 carbine
Type-44 carbine
Type-97 sniper rifle
Type-99 rifle
Type-92 Revolver
Nambu Type-14
Nambu Type-94
Type-11 lmg
Type-96 lmg
Type-99 lmg
Type-97 lmg (inside of vehicles)
Type-92 hmg
I don't see any point in featuring the Type-1 or Type-3 hmgs
Type-97 AT rifle
Type-97 or 99 hand grenade
Rifle Grenade Launcher
Type-98 Knee Mortar.
Type-1 47mm AT gun
Type-11 75mm AT/AA gun
Type-96 25-mm AA gun (triple-barrel configuration)
Type-92 "Battalion Gun" (70mm howitzer)
Type-98, 320mm mortar on an Iwo Jima or Okinawa map.
Ehh, I may as well go into tanks now.
Type-94 Te-Ke
Type-95 Ha-Go
Type-4 Ke-Nu
Type-97 Chi-Ha
Type-97 Chi-Ha Shinhoto
Type-97 Chi-Ha with 150mm howitzer
Type-2 Ka-Mi
Type-1 Ho-Ha
Type-1 Ho-Ki
Type-1 Ho-Ni (only available in small numbers, but may need to be featured to balance against Sherman Tanks)
Type-4 Ho-Ro simply because it looks funny.