Tortoisehg2.0 seems to have lost feature to set the current bookmark
Created originally on Bitbucket by johnfo (John Forrest)
Prior to Tortoisehg2.0, if you right-clicked on a changeset and selected "update", you got a list of things to update to. This list included known tags, which at that time included bookmarks. The effect was that you could update to a particular bookmark. (equivalent of hg update -r "bookmark"). I can find no such feature in the 2.0 GUI.
Note that updating to a bookmark is not the same as updating to the changeset it is currently pointing to, as this also sets the current bookmark.
The effect is to require the user to do this on the command line.