You'd want to add products through a product import anyhoo... in which case you could add the conversion rate and calculate it globally on your spreadsheet which you could then convert to csv. That's how I do it right now which you're right, is a bit of a pain. I just want to "lick it and stick it". If you're interested in this sort of mod, I'd encourage you to go with xcart as there will probably be more mods down the pike you'll want and it is much more robust and widely supported... You'll also want to think about how to get products into your accounting software such as quickbooks... which thub by
www.atandra.com is great for.
Cheers,
Blayne