I called up the JBHifi number to ask why they would no longer allow people to pre-order items to collect in-store without paying postage for items that were being shipped to the store anyway... but ended up talking to someone who was just there to answer calls and was unfamiliar with the problem, so I didn't end up getting anywhere with trying to get the problem fixed.
Unless a listing specifically says that it is delivery only, the stores are getting stock sent to them, and before June all of those Transformers toys could be pre-ordered online for pickup at a store. I just want that fixed, so that I don't have to always go to a store to do the order, particularly if I was wanting to pre-pay for an item.

As for the missing Gen2 redeco listings - I was at my nearest store and was able to pre-order the remaining four Deluxe toys by using their SKUs, which I had fortunately written down a week ago (I haven't been able to go out for over a week, but wrote down everything ready for when I could get to the store).
Now to see if they still get the stock, and enough of it to cover my order.

BTW, the Toxitron toy was meant to be out tomorrow, but has indeed been pushed back to August 31st. I wouldn't be surprised if the other Gen2 redecos (which had August 1st as their release dates) have been pushed back to that day as well.