I've heard we're one of the few democracies that doesn't have proportional representaiton although I haven't seen all the numbers.
Certainly a lot of these questions could be answered by looking at many of the nations that currently employ it and how they do things. Unfortunately I haven't done any in-depth studying on those so I don't have the answers for you.
As kn says, I think we'd have to change the non-confidence criteria or we'd be faced with constant elections. But I would feel much safer with constant minority governments that are forced to work together and compromise. That appeals to me a lot more than a majority dictatorship by one party.
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