Update of issues should provide at least the same features as context menu on issues table
If the mouse is moved over a table row on the issues table a context menu opens after a right mouse click.
From there it is possible to change tracker, priority, assignee, target version. It was rather difficult to find this way of changing properties of an issue.
I had expected to be able to do this via the "update" action of an issue. But at least the tracker cannot be changed there, although it should be possible to change it there.