[OSM-newbies] placing a POI at a precise location

[John F. Eldredge]

If you know the latitude and longitude at which a particular POI should 
be located, is there a Linux tool (whether GUI or command-line) that 
lets you add a POI at that precise location?  You can enter coordinates 
into Potlatch, but then all that it does is show you the tile containing 
that location.  It doesn't mark where on the tile that location is, and 
dragging a POI location onto the map, or double-clicking, still leaves 
the possibility that you won't be at quite the intended location.

Also, is there any way to pan, as opposed to zooming in or out, while in 
edit mode in Potlatch?  Being able to scroll the location, without 
having to change from edit mode to view mode and back again, would be a 
time-saver.