Event export/import doesn't include event data

I just tried to export some CCK-based event nodes from a 4.7.6 site to 5.1 site. In both csv and xml formats, the node create and change timestamps are included, as are the CCK fields, but the fields from event module (event start and event end (and timezone)) weren't included in the export.

(Also, on the 5.x version, with Event module enabled, no event start or event end field mappings are available during import. A quick browse of the code shows several cck definition files for the importexportapi module, but nothing for event - does this mean that catering for events is a feature request instead of a bug? )