Sure. In either model that we have talked about, you could allow people to rank parties or rank candidates. In the single transferable vote, ranking parties or ranking candidates is usual, so in PR, ranking is often built in.
When you build it in to first past the post or winner takes all system, you actually exaggerate some of the difficulties in the system. If what you're looking for is greater representativeness and a greater ability to capture the diversity of views in Canada, the use of ranked ballots, when attached to first past the post, doesn't do that.
Ranked ballots is a kind of subset. There really are two big choices: a winner-take-all approach and a proportional approach, and either of them can have ranked ballots. The fundamental decision is which of those objectives you are pursuing. Are you pursuing single-party majorities as the norm, or are you pursuing greater representativeness as the goal?