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Not sure if this is the right place for it, but I didn't see a better section so here goes...
I would love the ability to press and hold a key to have health bars displayed and have them go away when I release the key. I know there is currently a setting to turn them off or on, but I would find it much more useful to be able to hold (for exmaple) the "h" key to show them and release to make them go away. It's been a few years since i've played DotA, but I think there was a feature like this in there, either via a mod or native to the game. I know this isn't DotA and I'm thankful for that (I stopped playing for a reason), but this is one of those features that I would love to see implemented in LoL.