Clarification questions were asked. They somewhat confirm what I saw and what I thought I knew: under the Standing Orders, we can in fact issue a dissenting report.
In my opinion, the term “may” doesn't necessarily mean either that we legally have the committee's permission. When I had occasion to do so, I of course did it on behalf of the party. I didn't even have to request consent because it was automatic. The Chair signed a report to which the dissenting report was simply appended. I don't see why we would establish those kinds of rules, when they already exist under the Standing Orders.