there are two ways around it, but they're kinda a pita. one: you can make multiple profiles each with their own barista. each profile will have that 292 game limit. another option is system config tool. there is no limit with it, but it's just a long list of games, so it's not as aesthetically pleasing.
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btw, there's an app (never used it) that can sort content alphabetically, and I'm pretty sure it even works in folders in case you try a third option: multiple hdds/flash drives. it was still in experimental stage from what I remember, but a lot of people claimed it worked for them. one might compare the wii u to the vita in that it's one hell of an emulation station, and removing the hdd/sd card forces a rebuild of the database. that's why it doesn't save the games. it's possible to have the same page/position for a game on the vita, but either only one (not sure how it's determined) shows up or neither shows up. the wii u probably has something like that in the barista file, which I think is its indexer.
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alright, here's that app I mentioned: https://gbatemp.net/threads/wii-u-menu-sort.455132/
thanks for the link/ideas, large boring looking list sounds fine to me I don't care about the aesthetics, I'll look into sytem config tool.