Uh no, I should probably record it, only reason why I know that it does that is that I wrote a stub to fake the keypad input using a normal controller and Mega Anser did that. From a video standpoint, it'll look pretty much the same except for showing 練習用 and that the actions taken will be different.
But yeah: https://plutiedev.com/blog/20190119
Computers were way more expensive than consoles is what was going on (everywhere, not just Japan). Well, and Sega originally wanted their consoles to be used for more than just gaming. Brazil had their own banking software as well and from what I recall reading in an interview here it actually saw some significant use?
Nowadays with cheap computers and smartphones it makes no sense, but at the time it did.
No idea, though nobody seems to ever question about Tectoy having a license and we know that they had a close relationship with SOJ, so they probably did (let's be honest, they probably just had to ask when needed).

