Correct. You can use steering wheel controls to navigate to higher folders. Just press > button and wait for 1-2 seconds.
See above.
We suggest having different sticks with manageable number of files. You can change them on fly and all positions will be restored.
As explained in FAQ your stereo will be able to display tracks up to 99. All tracks >99 will be truncated in digits. Say track 13456 will be displayed as 56.
Also SCAN feature has option for folder browsing and not only +-10. Check our FAQ.
Hope it helps.