Fall of the Rising Sun Ultimate is more like TMO by itself. While we've attempt for more immersion and less "difficulty", we've also gone with a more unpredictable set of campaign layers. Other than the Battle files and a bit of the Aleutians traffic, it is almost all RGGs (Random Generated Groups), but with a slant toward easier AI to start the game, progressively tougher as the game proceeds. Less traffic early, more traffic in the middle, and less traffic late as the war progresses. It also uses a beautiful environment for just about every aspect of "life" in the game, from sunrise to sunset and through the night, the colors and sounds will pull you in... yes, I am trying to sell you on it...
For a similar experience, but with the slant toward an RSRDC-style game, there is always Bleiente's choice of
Ralles RealModPack for TMO_RSRDC_OTC, which is a nice blend of the mods, including
Optical Targeting Correction from CapnScurvy. Bleiente also tweaked the environment in his mix. It is also lots of fun to "play" - which is why I use MultiSH4...