Hello Febo. One option is to use Facebook tipping application that has FER wallet among 38 other coins including BTC at https://apps.facebook.com/wpmultitipping/ and within Ferengicoin group https://www.facebook.com/groups/ferengicoin/ make your offer someone will accept an exchange at the rate both agree. Multitipping group link is https://www.facebook.com/groups/MultiCoinTipping/
Ferengicoin has 3 new groups on Facebook which are not yet authorized by tipping application admin but once authorized will allow tipping within them for exchanges, trades, betting and even funding your project with FER coins:
https://www.facebook.com/groups/ferengimarket/
https://www.facebook.com/groups/ferbetting/
https://www.facebook.com/groups/ferfunding/

If you don't want to trade at Ferengicoin group for any reason (unacceptable rate for example) we can help you to purchase FER with BTC at exchange rate, however we cannot do it too often. If you send us BTC, we will buy LTC on Cryptsy, then on any market that has best possible LTC to FER rate (usecryptos.com europex.eu or coinano.com) we will buy FER coins and send them to you. We will do it free of charge, all transactions will be recorded and screenshot taken.

Another way to buy FER with BTC (may take longer to find seller, but may get better rate) is posting your offer here http://ferengicoin.org/smf/index.php?board=5.0 or Reddit: http://www.reddit.com/r/Ferengicoin/comments/22ai0o/ferengimarket/ or fer auction at http://ferengicoin.org/webid/

You may contact us here by comment or PM, twitter @FerengiCoin or Facebook https://www.facebook.com/ferengi.coin

Best regards,
Ferengicoin dev. team