Is it possible to add info or help text to an iPhone settings bundle?

Answer 1

No, 100% sure.

Answer 2

The way I do it, and the way I have seen other third parties apps do it is just to use an informative Title as a PSGroupSpecifier

I have only seen the native Apple apps do it in this other, slightly nicer way. I expect the ability is buried deep in the undocumented regions of the SDK.

Answer 3

According to recently changed Apple document, a FooterText key is available in PSGroupSpecifier dictionary, which is only available in iOS 4.0 or later.

Reference: http://developer.apple.com/iphone/library/documentation/PreferenceSettings/Conceptual/SettingsApplicationSchemaReference/Articles/PSGroupSpecifier.html#//apple_ref/doc/uid/TP40007009-SW1