andersonGPS,
HMMMmmmm, I'd say that the Magellan Kit achieves a GPS lock (assuming your outside) within a few seconds of the application starting up. If you take into account the application boot up time, it's more like 20-30 seconds are you described, and even faster when mounted in the car kit cradle (undoubtedly because of the stronger GPS chip).
Additionally, if you look at my post above to pjo63, I've provided screenshots of me using the Magellan App this morning while in Airplane Mode. When turning on Airplane Mode, and starting up the Magellan App (outside of the car kit cradle), the "Looking for GPS signal..." indicator will continuously spin with no end in sight due to the iPhones internally GPS chip being disabled. If I go back into setting, turn off Airplane Mode, and then fire up the app...GPS lock is almost instant. So with this information at hand, it seems fairly certain that the app is utilizing the car kit's GPS chip solely (since cell service/triangulation and the internal GPS chip are inactive).
Within the Magellan App, there is no detailed GPS reception information, except for the typical "reception bar" signifier (like AT&T reception bars) which can be found by clicking the OneTouch button in the upper right hand portion of the screen. (*note* - with Airplane Mode on, there are no reception bars).
I know TomTom has the "Car Kit Tool" which supposedly gives you all the information you are referencing above, but it's a separate application. Is this not the case? I hope that Magellan will also release a standalone app or just incorporate it within the Magellan RoadMate App itself (or both). This would help to answer all the unknowns in question.
Maggie, are there any plans to release something like this?
Regarding your question about switching from the car kit GPS to the iPhone, I haven't yet had my GPS signal get disrupted when removing the iPhone from the car kit's cradle. Whether or not it does lose receptions for a moment or not, I'm not 100% sure...but I don't think it does. Seems like a smooth transition without any faults, so I hope this clarifies your concern.
If you have any further questions, feel free to ask. I hope I've helped at least a little.
BTW, for those who are wondering (and have asked), I DO NOT work (nor am I affiliated with in any way) for Magellan. I just happen to be a lucky consumer who was offered the chance to receive the car kit early, and accepted.