No direct way to revert multiple revisions
TortoiseHg allows reverting a changeset by selecting it and using the "Backout..." item of the contextual menu.
When one has several revisions to revert, there is unfortunately no way to revert them all directly. One has to select the last, do "Backout...", then select the pre-last and back that one out too, until the first. Not only does this take more time, but it results in as many new commits as the number of reverted revisions. It would be better if, when multiple commits are selected, the contextual menu still offered "Backout...".
This affects TortoiseHg 6.4.2.