Basic Customizations are now available.
Default View -
Latitude
Longitude
Zoom Level
Base Layers (On/Off) -
Satellite Imagery
Cities
Political Boundaries
Roads
US Counties
Display Settings (On/Off) -
Use UTC time? (Otherwise, use browser's local time)
Show labels on rasters? (Black labels will appear with the data value or an area.)
Drawing Tools -
Polygon Color / Alpha
Line Color / Alpha
More to come...