That's not a bad thought, but I think it would ruin the cosmetics of the weapon. The five fired shots is to represent the overpowering force of a bear, whereas the rapid fire bursts would look more like a snake of destruction. I do think your idea works great and would definitely improve the weapon, but to keep the theme going I think that the original function would do best.
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I only introduce the option because if all the rockets were shot at once, I'm assuming what would happen is that all of the rockets will damage the target at the same time which would make the perk for returning it to the magazine virtually useless. I get that you want to stick to a theme but I'm only introducing this option in order to utilize the full potential of this weapon.