I feel an important section would outline different procedures for dealing with injury (of oneself or another), steps to take in a emergency, the best items to carry should one occur and which items are available from the bush in these occasions.
Obviously, there is a lot of knowledge here that would fall into the 'first aid' category, which would best be garnered from a St Johns handbook, but asides from this, we have plenty of additional knowledge which does not fall within those pages, and is rather more specific to the bush.
Saying that, a contribution may just be something simple like a effective homemade insect repellent, as everybody likes one of these at times, yet it's not worth using those ghastly store bought products.