Quick Select multiple users for PMR
You can select specific users to run the PMR on, but you have to search each user one by one. If you want to scope down the PMR to a specific department of 40 users, you have to manually add those users by hand and it takes a long time.

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ian.martin commented
Quick manual selection would still not be enough for us - we have 160,000+ users in our tenant and constantly need to report against various sub-populations. The attribute that we typically use to scope those sub-populations is the Company attribute. To make ShareGate a suitable long-term tool for us, as a minimum, we need to be able to scope ShareGate reports against members of a group. It would be better if we could scope a report against Company attribute values which would mean that we do not have to create groups based on the attribute value.