not following proper pattern procedures
What are "proper pattern procedures?" He certainly hasn't violated any pattern-related FARs, not that they apply in this case.
Aerobatic flying is not reckless, and neither is bush flying. The principal reason that they are not reckless is that risks are not taken unnecessarily. This pilot does not need to take the risks that he does to accomplish his mission (viz. dropping off skydivers and then landing normally).
His mission is to fly as many skydivers as he can within the limits of his aircraft and skill, and that is EXACTLY what he is doing.
The flaws in his pattern are, to my mind, as follows: (1) excessive bank;
How much is too much? Doesn't look "excessive" to me.
(2) excessive airspeed (justified only given the altitude);
It's the other way around - The airspeed justifies the altitude. Airspeed + altitude = energy. He's attempting to get rid of energy, and the fastest way he can do that (again, fast is the mission here) is to keep his speed up as far down as possible, maximizing parasite drag, followed by bleeding the rest of the energy (airspeed) away with a fairly steep bank to maximize induced drag.
(3) way low altitude (never justified);
Why not? Again, he's got the energy he needs at all points to remain safe. He's not flying low over any people, he's not endangering any persons or property...
(4) non-standard pattern (he does not fly a base leg);
So what? It's about as close to a standard pattern as you can get. There are lots of times I don't fly a base leg, especially when there's a crosswind from the pattern side of the runway (tailwind on base). Check for traffic on final before the wing blocks your view and there is absolutely nothing wrong with a curved path from downwind all the way through to final.
(5) not only is there no final leg, he turns inside the numbers, not getting aligned for landing until well past (1k ft?) the end of the runway.
I don't see any runway markings at all, so chances are the lighter pavement is a displaced threshold. Besides, nothing wrong with landing long provided you've got the runway available for it.
It could well be that that was an uncontrolled airport. I, and no doubt many of you, have flown out of uncontrolled airports where there are pilots who do not have a radio. I wish the FAA would change that, but that's the way things are. In that case, the NORDO pilot has a reasonable expectation that aircraft will fly in accordance with published pattern procedures and regulations.
This guy sits in this same pattern ALL DAY LONG and he probably has the best viewpoint of all for seeing other traffic come in - When he comes bombing down from above, there will be lots of relative motion between inbound airplanes and objects on the ground since his groundspeed is near zero, making any other traffic easy to spot.
These include, but are not limited to, flying a base leg (this guy didn't);
How does that affect anyone else in any way?
flying a final leg (nope);
May I point out that some of the approaches into Airventure have no base (9/27) or final (18) by design, and that the design comes from the FAA...
not crossing over the side of the runway before getting lined up 1k ft (or whatever) past the threshold.
Like I said earlier, I expect that it's a displaced threshold - Note that the portion of the runway he used for landing was nice black asphalt and that what I believe is a displaced threshold and all the taxiways were older, lighter asphalt. And again, there's nothing wrong with landing long.