"I loathe the ASX rule where a non-performing company with a plummetting share price can suddenly sell your shares without your permission just because it's become an "unmarketable parcel"."
Thats a very odd claim. They can't "suddenly" sell them, and companies very rarely do. They have to introduce a scheme to do it and get it approved by shareholders. Then shareholders with small parcels have the right not to have their shares sold for them.