Not really a feature request, but in the FAQs it should be SUPER OBVIOUS that MacMiner needs to be in the Applications folder. I had a lot of troubles until I came across that tidbit.
Also, the language might be more clear if the Pool Setup page didn't say BTC and LTC and instead said:
SHA-256 Mining (Bitcoin, Peercoin, Devcoin, etc)
Scrypt Mining (Litecoin, Dogecoin, Tagcoin, etc)
Just a thought. Great app!