In version 4, I believe there was an option to import patient demographics as well as patient encounters.
I see that there is the option to export these two options but I have not found out how to import patient encounters. One tab is available to import demographics and I would assume that an import feature for patient encounters would be beneficial (as well as importing of other data saved out to csv files).
I would suggest that in the import/export section, if there is an export feature for any specific file, an import feature for the same file would make things a lot easier in the future. Especially if the imported data can be appended to the current data in a specific category or replace altogether (similar to how patient demographics importing is structured).