What sounds specifically do you think need to be added to the list, may I ask? The example I provided with "tyu" is pretty indicative of the rest of the sounds that were left out of this list. All the words that include dyu/tyu are loanwords; for 'tyu', there are exactly 3 that begin with it. And it is replaced by 'chu' anyways in almost any context. What do you mean by editing phonemes doesn't 'work' for loanwords?more words! :-D
I believe it's certainly comparable to a "_angsts" end cluster in an English reclist; is it in the language? Yes. But only once. No English reclist you'll find includes that cluster; it's easily synthesized within UTAU for its singular purpose, and would otherwise just be filling up space.
The other parts seem to be addressed otherwise, but the aspiration is not referring to the nasal. It refers to stylistic aspiration that Japanese singers use. Ruko Yokune Kire is a whirlwind of aspiration; some reclists have taken the time to differentiate between the aspirated and nonaspirated variants of a consonant.
The only phonemes that have to be falsely synthesized in this list are non-Japanese ones. That's the point; it's Japanese centered. No nonsense.
As for 'standard' vs 'lite' VCV patterns, if you've ever written lists before, you'd see that they all fall into identical patterns based on their mora. It all depends on where one starts the pairing list. This reclist writer chose to start writing at the most logical point (a_a), which is what the OREMO list did as well. They're both the most logical constructions of the list. You can't 'rip off' math.