More sophisticated toggles can be enabled for particular groups of users. A feature may be enabled for a small group of trusted testers who receive early access. Once it is validated, the toggle can enable the feature for all users, perhaps by enabling it for successively larger groups.
Yes, this is helpful. I'd also add easy way to opt people into the feature (including self-opt in).
Is it wise to keep a/b testing completely separate? I think so, as it's might be easy to foul up a test if settings get changed (or if self opt-in is allowed, for example)
