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Welding pressure varies from model to model and material to material, but generally welding is done in the 12 - 20 PSI range.
Blocking forge openings
It is really not necessary. Blocking off an opening creates higher backpressure in the firebox, which slows the flow of air into the burner. Less air means a richer and cooler flame. Blocked openings also force the forge exhaust (Dragon's Breath) out between the shell and whatever material being used to block the opening, causing damage to the shell material.
The openings are designed to be small enough to retain good heat while still allowing good access for your material.
Burner running erratically
It will be one of two things, either your gas pressure is low and the flame won't "blow through" the burner tube. To overcome the backpressure in the firebox simply blow into the mouth of the burner, like you're blowing out a candle. A quick puff of air is sometimes all it needs to push the flame through into the firebox.
If that does not fix it, you may have a small piece of debris inside the gas tube partially blocking a gas orifice. This is also a quick fix, remove the brass caps at ends of the gas tube assembly (see pic)
and blow the tube out with some compressed air (see pic). Reinstall your brass caps and you should be good to go.
Independent Burner Controls
We do not have independent burner controls for two simple reasons, 1) they serve no purpose and 2) they are potentially dangerous.
What keeps the burners cool while running is the flow of the fuel/air mixture through them (the flame actually burns inside the forge chamber, not the burner tubes). Given the fact that heat rises, if a burner is shut off then is becomes a chimney, and that heat from the forging chamber is going to rush up through that extinguished burner, in a well lit shop that burner tube could be bright orange without you even noticing it. All burners must run continuously while the forge is being used.
In regards to saving fuel by shutting off a burner or even turning it down to achieve some kind of imaginary “zone heating”, think of it this way. Imagine your house is 1 large open space with no interior walls. You have 3 furnace vents, 1 in the center and 1 at each end. If you cover a single vent at one end, does the heat from the other 2 vents stay on it's own side while the other side with the covered vent cools down? On the contrary, the heat from the 2 working vents will try to fill the whole space, and now the furnace cycles will run longer because you only have 2 vents operating, so additional fuel and run time are needed to compensate for the covered vent.
The interior chamber volume of the forge is a constant, and regardless of how many burners are running, it will always require a specific BTU input to keep it at forging temperature, whether it's being heated by 1, 2 or 3 burners. Turning off 1 burner will require you to turn up the gas pressure to get more BTUs from the 2 operating burners. Independent burners controls simply don't serve any purpose other than sounding good on paper, but they do nothing in regard to fuel saving or "zone heating", it's all just hollow hype.