Yes, they are not being very helpful.
I have made some queries in this post Confused About Unlimited Plan
but unfortunately does not have answers exactly to my questions.
My point is I signed an unlimited BIS plan with my Telco and they told me only using default apps for data access will not be chargeable. Any other 3rd party apps such as Operamini, BBweather, Google Maps, etc will be chargeable. In this case it appeared unlimited in my case is only valid for push mails and web surfing using BB browser and nothing else, which I find it very odd. Of course I am referring only to local access and understood out of my country all charges will apply.
The faq site that you mentioned stated 3 conditions, without plan, generic plan and Blackberry plan. It mentioned with the Blackberry data plan "you may do all of the above plus more". I presumed the BIS that I signed up should be the BB data plan, which prompted me to refer the Telco to the faq site.
They did not specifically state which info are not accurate but mentioned only some info are not true and that it is not a RIM url.
I just need to know how to tell which apps with data access are chargeable in order not to incur unnecessary extra costs. It appeared the Telco is also not very sure, for example they told me in one instance that BB Maps used with gps will be chargeable and subsequently they came back to me that it was a mistake and it is not chargeable under the unlimited plan. You see my point.
I would like to check with RIM directly but in their site there seemed to be no where to ask them questions, perhaps you can assist.