The answer depends on how many different camera models you use. You could easily hand-pick a set of interesting tags if you only have a few different models. Otherwise, it will be harder to decide which makernote information to include. The IFD0/ExifIFD information is basic, and doesn't include interesting things like the camera serial number, lens model, focus distance, and sometimes even ISO which may exist in the makernote information.

I suggest defining a shortcut tag to represent all of the tags you are interested in. There are already pre-defined "Canon", "Canon20D" and "Nikon" shortcuts that may be a good starting point. See the config file documentation for an example of how to create user-defined shortcut tags.

- Phil