I want to be able to use a xmp that has caption and copyright info and be able to add it into the presets at time of import. Can this be done? like you can with Photo mechanic when you ingest the photographs?
You can't do that directly in LR. However, the user presets are simple text files that you can edit. If you're technically minded, you could write a script that transforms the .xmp file into a user preset. To see what the presets look like, click Show Lightroom Presets Folder in Preferences > Presets.