Gotta say, love this "mid field" crosswind thing.
The CASA recommendation (if you watch their DVD) is when joining crosswind to join "mid field' crosswind. And it seems that we instructors teach this as gospil.
Ever seen a first solo nav student join "mid field" crosswind on an 800 metre strip. By the time the downwind leg is established their almost at their 45 degrees and ready commence the base turn. Rush Rush Rush! Different circumstances require a different approach. A "mid field" crosswind joining of the circuit at Tindal is completely appropriate (given the length ofthe runway).
Joining downwind, flying 3 legs of the circuit (as stipulated in the AIP), I dont see the problem. In saying this, there is also guidance in the AIP in selecting the most appropriate runway (consideration given to into wind).