Allowlist for local client configuration via Fast Flags

[Dogekidd2012]

@HealthyKarl

Why couldn’t there just be a blacklist instead of an allow list?

See my reply to this on a related feature request:

https://devforum.roblox.com/t/fast-flags-are-being-used-as-cheats/2942346/18

@Dogekidd2012

This simply isn’t sustainable and requires that we play cat and mouse and constantly make sure that specific FFlags can’t be abused. Also, even if this was added, it certainly wouldn’t include reverting to old CoreGui, as the end state of most flags is for the code it’s replacing to be completely removed for maintainability reasons–we would just be encouraging delaying the inevitable.