People do complain a lot about the fact that you cannot get 100% separation between the left and right hands. For the longest times I was one of these people... but the facts are that once I started making recordings, to get a proper blending of a realistic sound stage image, I had to blend the right and left hand channels together anyway... so in effect, I was getting too much separation and had to compensate for it either in post production or in the accordion settings!
There are a couple ways to do this and when done in combination one can get near 100% separation... Yes, using the WIDE settings in global is the way to start, but unless you go in to the pan settings of each desired instrument and bass and pan them full left or right, you won't get maximum effect.
For purposes of having greatest control of the sonic stage in your DAW, you should use the above along with recording them on 2 individual mono tracks (no need to record in stereo and then separate in to 2 mono tracks... small waste of time), and in the DAW you can control the image to the greatest variety of needs and desires.
In my recordings, I try to follow one mantra with this one question... "what would it sound like if I was listening to you in real life?". There is no acoustic accordion on earth where when I am standing 5 feet away in front of you as you play that accordion and where 100% of the sound of the treble is in my left ear and 100% of the sound of the bass is in my right ear. YES, there is a difference between the hands in the left adn right ears, but using a DAW pan setting sense, it is when the volume is pushed between 6% and 10% to one direction or another at most (those that watched my videos of how I edited the music of 2 fellow acoustic accordion players here, saw me emphasize this on the video). So if you want "real life sounding" sound image, that's the settings you use (which incidentally on a Roland V-accordion are near the 100% factory stock settings based on their settings and the proximity of their left/right speakers).
That is why you will NEVER hear me create a recording where 100% of the right hand is in one ear and 100% of the left hand is in the other... it is physically impossible to do in the real world and sounds bizarre, especially if you are using a headphone or quality stereo/speaker setup.
Where control to create a more "creative" stereo image comes in to play is when we can do things like I sometimes do in my DAW settings with acoustic accordions to set that to a more aggressive setting, offset them by 10-20% more than above and that leaves a sonic hole in the center that can be used to add a solo instrument or singing or a percussion attack to punch through for that wow factor that most high-end professional recordings use too. This is how I use the ability to separate the L/R channels, not to "butcher" them, but to give me added control in the post production editing process to place that instrument in a specific location in my sound stage.
Sorry, I fell off the deep end. TMI?
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