Champion-specific settings and toggles are not something we want to do, it ends up being a rabbit hole where before each game you need to adjust your settings or don't feel like you can play a champion until you have tweaked their own specific setup.
There are situations where players might prefer using an existing setting over another with a champion, but we are not happy when something must be used (Looking at you Riven, and Dash in Move Direction: Off).
I understand that shooting the projectile away from your opponent is a bit odd, but we felt it was worth it to avoid situations where tap casting the ability would basically be trolling yourself if the first cast went toward your target. It can still be aimed in situations where you do want to send the first cast forward, though that will likely be less common.
As for the bug you problem up, this isn't something I have seen, but if you have a clip (ideally showing your screen touch position if possible)...
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