Here's the gross example that I alluded to earlier.
I input the latitude and longitude of
to position a marker (cruise ship) in the Pacific Ocean.
After saving the placemark, these were the latitude and longitude co-ordinates that the plug-in returned
and the cruise ship marker is on the Australian mainland!
In order to get the cruise ship close to where I wanted it, I had to use "Bay of Wreaks, Kiribati" as the address
(which returned this latitude and logitude 1.8616363,-157.3205418)
and give up on using the latitude and longitude co-ordinates I preferred (I actually wanted an "at sea" marker to be "at sea"!).
If you look on this map
you'll see two cruise ship markers (you'll need to zoom out a bit and probably drag the map to the left to see the Kiribati marker). The cruise ship in the Pacific was placed using the Kiribati address above, while the cruise ship on the Australian mainland was placed by attempting to input the -4.915833,-157.5 latitude and longitude directly.
As I said earlier, this is a pretty gross example. Other changes to co-ordinates entered directly don't seem to be as bad, but certainly they are "off" where you entered them enough to be annoying.
Hopefully, being able to override geocoding for latitude and longitude points entered directly will be possible and should solve the issue.
Can you please let me know when you've finished looking at my example above because I'd like to remove the land-locked cruise ship before my site visitors wonder what I'm playing at :-)