In the Permissions Matrix report, when all expanded to show group members, it would be much better to have a separate section of the report that only shows the various groups' members once, rather than repeating them on everything. Ideally the report would then just list the group names once, and then explicit permissions listed individually. Does that make sense?

Same with the Excel export. Possibly export the report with 2 tabs, one is the matrix the other is the list of members of all groups.

Use of graph Api (app registration) for access on Spo and MS Teams
Giving admin roles for migration is not appropriate however granting access via graph Api is possible, when will sharegate starts working such requirements.

We need the ability to migrate current permissions from one permission group into a new permission group. We are currently moving our collab sites to SPO. New permission groups are created with the site and we want to move the members of the groups in collab into the new group created in SPO. As it stands today, we need to retype the users in or move an old permission group into SPO.

Make the Permissions Matrix Report show the Site Collection Administrators when selecting a site collection.

When using "Copy User Permission" with the "Copy Group membership" on a subsite, the tool will add the target user to all SP Groups in the site collection, not just those that the target subsite has access to. This can lead to a user having access on sites not scoped for the "Copy User Permissions" operation

Not sure if this is possible, but make it easy to convert who is in a SharePoint Group and add them to a team membership group.