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Your reasoning actually comes quite close. I found a quote through Quora, credited to John Lienhard from the University of Houston after having contacted Pilot: "The trick is to keep just the right amount of ink in contact with the wick that feeds the delicate roller ball tip. The discs are baffles that balance the forces of surface tension against air ...

This is a hard question to answer, because its based mostly off of personal preference. Out of those two pens, I personally prefer the Elite Vision, because the Air micro is sort of like a fine liner tip, and doesn't glide as easily. If I could choose any pens, my first pick would be the Pilot V Ball RT Extra Fine. They're pretty cheap, and they glide across ...

All Uni-ball rollerball inks seem to now be permanent (vs. water, UV, fading). Pentel has permanent ink too. Most manufacturers make this a clear selling point if you search 'permanent rollerball ink'.

With most fountain pens, adjusting the rate of inkflow usually comes down to adjusting the fit of the feed (the plastic piece that lies against the nib) to the nib. The bigger the airgap between the two, the faster the inkflow will be, and the smaller the airgap, the slower the inkflow. However, while it's typically very easy to adjust for more inkflow, ...

Sadly no, gel pens are water-based and don't adhere well to plastics. You'll want to use a ballpoint pen because the ink is sticky and oil-based. This will be semi-permanent, though you could use an erasable ballpoint pen like the Pilot Frixion which can be wiped up with no problem!