I'm in the EU, but have so far only ever dealt with mt.gox in USD.
So to summarize, I have to buy BTC with mtgoxUSD, then sell BTC with mtgoxEUR before I can initiate a SEPA withdrawal (there's no automatic USD-EUR conversion like there is on bitstamp)?
I asked this to the support desk, and this was their answer:
Thank you for contacting us. You can not make an direct currency conversion. However, using USD you can buy bitcoins and sell it through EUR and get back the funds into your euro wallet. On going forward you can use both SEPA or International wire method to withdraw EURO. Could you require any further assistance contact us.