Use Move-to on the control panel - pressing '>' will read the current location into the fields.
To add a vertex, select two vertices and then Vertex->insert-vertex to insert a new on between.
For a place marker, you could add a line that has only a single point.
To access the menus without the mouse, press alt e.g. alt+v then up-arrow, then enter will select reset-views. (Doing this I've noticed that two menu items have the same key shortcut - thanks, it will be checked for the next release)
Andy
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