If you are a “one man band” when taking photos, then it has probably crossed your mind that an extra hand would come in handy (pun not intended). There are several ways to have both your hands free and still take shots, and one of them is probably by using your foot.
Audrey Love (aka Audrey Obscura) had the same problem, so she built her own foot pedal for Canon EOS 5D Mark II. It doesn’t take too much time or too much money, and it even autofocuses before taking a photo. So if you need an extra hand – you could give it a shot.