Well, uh, so, having concluded all this, what's the best course of action right now?
Try to reverse-engineer 1942 for MSX2 to make it better?
Keep talking about how it sucks?
Donate our MSX machines to orphanages and trade them in for a NES console?
Send dog turds through the mail to Namcot?
Oh, please excuse me. I didn't receive the memo that we're not allowed to joke anymore from time to time. 
The point that I tried to make was - we can discuss until the end of time and our grandchildren have long beards, on how this sucks and how that sucks, but we can also do something constructive or creative about it. I think we know by now that the game is not perfect and eligible for improvement.
Perfecting a game on MSX until it's almost identical to the arcade version does not make sense anymore, unless you think about it as a technical challenge (that's how I view my Outrun development). It made sense in the 80s/90s, because you had only your current hardware to try to play a certain game. But since the emulators arrived (especially the arcade emulators), anyone can play the original version at home.
What sense does it make to have the perfect 1942 on MSX, when you can just fire up MAME ?
PS : I must say I played my share of that game in the arcades, I was a great fan of 1942
I would love to see some custom speed-patches for the MSX2 version to fix some of the minor visual glitches/timing issues; add sprite prio-rotation to minimize flicker and perhaps address slow-down; even if it's just with software Turbo-CPU calls; possibly also sacrificing some of the 'annoying' sound effects; I would love to trade in the shooting sounds FX for some visually used CPU cycles 
Perhaps I'll have a look sometime myself; albeit I gotta focus on my current dev project first !