Yes that's right and the .ExifTool_config allows you to create the definition for a new tag within your system so that it can be written. Unknown Tags can be extracted by ExifTool, so that's not a problem. Reusing other Tags such as Altitude will mean that the data will be overwritten if you use other geotagging programs that use the field, say you used Geosetter to locate the image it would overwrite the Altitude info. and you would loose that data you carefully pushed into it! Much better to define a new field, for the info now, then as and when a new Exif spec appears with what we want in it we can use ExifTool to move the data from our own defined field to the "real" one. The major problem will be getting cameras to write non-standard info that there not expecting :-( Much better to go via the Logging route and then attach the new data into our custom field offline where it won't be over written.
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