1. Many 2.5" MHDDs have a
shock sensor installed in them; that's what this attribute tracks. The sensitivity of this sensor varies; I've seen some environments where someone very lightly placing their laptop on a table (while powered on) caused this sensor to increment, while another laptop (same model/innards) treated identically had no effect. It's not a failsafe indicator that someone is being rough with their hardware, but it can be an indicator.
Let's put it this way: I have a Toshiba MK5055GSX in an enclosure which has been used off and on (power-on hours count of 179) over the past 3-4 years. Its attribute has a value of... 2. When I received it, the attribute had a value of... 1 (probably a result of factory testing).
2. It sounds like one or more of the heads may have made contact with the platter, causing slight damage. The two LBA ranges seen so far are sequential, and may be related to the same physical area on the platter -- it's impossible for me to tell at this level.
5. The count is correct; the error is in that you're reading the "Data" attribute wrong (you're treating it like a literal decimal number). SMART attributes can be vendor-encoded; T13/ATA specification does not define the format of the 6-byte data section. This is one such attribute. HD Tune Pro does not have the intelligence to decode this attribute, so all you can go off of is the adjusted value ("Current" in HD Tune Pro) and compare that to "Threshold" and "Worst". Other tools (like smartmontools) may be able to. If you want me to expand more on this I can, including providing screen shots and proof. My aforementioned Toshiba drive is a great example.