Importing variations with the standard MarketPress importer

I have used the standard MarketPress importer but my client is keen to manage her 33,000 products off-line via CSV (albeit with some work-arounds, like product images [many are dups]).

My research around here indicates that Variation bulk-import isn't a feature (yet)?

Is this likely to ever happen?

If not, can I have some hints what would be required so I can point my developer in the right direction, perhaps building some functionality?

Do you have a paper we could read / digest?