Was doing some geotagging today and noted the following that would be nice:
LARGER thumbnails for the images (and a larger dialog window)
"Select None/Select All"
Capability to use ALT-click for multiple selections and SHIFT-click for block selections.
Instead of, or in addition to "+/-" for time adjustment allow the down arrow to enter (-) if you go "below" the default zero.
Perhaps some "hint" or guidance as to the effect of time adjustments.