I think even if App Review did read forums, they couldn't give you "OK" in advance before seeing the feature in the app.
I would guess your best bet is something like the App Review lab or some other contact to ask directly - but even this I wouldn't treat as 100% confirmation you can go ahead unfortunately.
The rules can change or the particular reviewer may interpret the rules differently.
Topic:
App Store Distribution & Marketing
SubTopic:
App Review
Tags: