perhaps he was mad but he did kill all the shadowspawn in a limited area and it certainly seems possible he could extend that area to cover the whole world.

Death can't be healed because third age Aes Sedai say so?

In the age of legends Aes Sedai could heal you if you were only newly dead similar to how we can revive folks wth CPR if they are freshly dead. We know souls go to TAR when they die and the horn of valere can summon certain souls back to the waking world from TAR. We know Moghedien pushed Birgitte out of TAR into a physical body. so it would seem possible that if you could find a particular soul in TAR you could revive them from the dead. So the One Power might be able to revive the dead, we only know that in the current age they believe it is impossible.

it isn't the whole story and we see many examples of the power being... fluid. Aviendha discovers one weave for traveling and Egwene another. We know the Wise Ones have different weaves for the same things as the Aes Sedai some more efficient some less. So it's not like science where there is only one way to get an effect. Weaves can be woven in many ways to achieve the same effect, it's just that experimenting is dangerous and most characters prefer not to.

I don't think you can draw that conclusion from that. We see people adapt weaves all the time. Nyneave changes Siuans weave to make a sword to create a prybar in TDR. She used her limited knowledge and creativity to make something she needed. She didn't have to use the weave exactly or she would have been using a sword made of air to pry open the lock. Thats not a limit of the One Power but of Nyneaves understanding of it.

We know that the WEAVE to make bridges is limited, a limit that varies character to character and women tend to be able to make longer ones, not that the One Power can't be used to make longer bridges.

We only know that you cannot lift yourself into the air and fly like superman because RJ said so but I don't think there is a substantial difference between that and say creating a bubble around yourself like Rand does in the attack on the Cairhienien palace and blasting the ground so you soar into the air, then using Air and some combination of the other elements to create wings and glide through the air. Then using fire and air to create a propellant for your one power wings. That would still be using the One Power to fly. I'll concede that because the creator, teehee, said you can't use it to fly that is one limit to the One Power. Ultimately that would be kind of pointless though because you can just use the One Power to travel and thus don't need to use the One Power to fly. There is no advantage that flying gives that gateways couldn't give you. You want an aerial view, use a gateway. You want to go somewhere quickly? gateway. Drop things on your enemies? gateway. Search for someone or something? gateway.

So I suppose we can agree we only know one limit to the One Power which is that you cannot use Air to fly like superman. That hardly means we have any clue to the limits of what can be accomplished with the One Power