Changing Who Learns What...

Is it possible to have multiple characters set to learn the same thing, i.e. SwdTech?

I haven't tested it, but I suspect you -can-, just not in the way you're probably hoping.

If you set two different PCs to learn SwdTech, it probably means that anytime one of them joins, the SwdTech list will be rewritten. So if Terra has 3 SwdTechs, and then Cyan joins at a low level, suddenly both of them would only know 2 SwdTechs. I suspect that if you then level Terra up to the point where she would learn the 4th SwdTech, the game would either crash or automatically enable all 4 SwdTechs.

Simply put, it's easier if you just give the learning routine to the PC who joins first. They will share the same SwdTech list regardless. The only thing making them both into learners will accomplish is crashing the game or causing them to fight over which Swdtechs are available.