Quick question about Safari

I recently purchased a 2011 Macbook Air. I love the way Apple's software and programs work, and thus have started to use Safari. I know it may not be regarded as the best browser, but it gets the job done for me, and I quite like it.

However, there is one minor annoyance I have found: when going into my email or some other account online, I can't find the option to have Safari remember my username, but NOT my password. It either saves them both, or it simply doesn't save either one.

I have searched all over but I can't find a solution. Any advice would be appreciated. Thanks!