Good news is that no one admits to option 3 yet!
I go sequentially, as I have seen too many people who are not patient enough and pop the clutch too early resulting in a type 2 over-rev. None of these have led to immediate problems, but I cringe everytime thinking of the wear, tear and stress occuring at redline ++
On the street I will skip gears on upshifts and downshifts, but the shift linkage is not made for those motions and I am extra slow extra careful to get the correct gear and rev. Tranny's are designed for the 5-4 downshift, not the 5-2. (I have also seen quite a few people accidently find 4th, trying for second, not a big problem, just lost time). I personally have a much harder time matching revs perfectly going from 5th, braking a while, and guessing where in the 2nd gear rev range I will end up. I just go from 4K to 6K rpm for every shift.
For now at least, my shifting is much faster than my braking, so I feel there is less chance of a catastrophic mis-shift running through the gears, plus as Mike said, it is nice to be in the correct gear for any given speed in case things change and you need to GO!