Premiere Pro doesn't have a keyboard shortcut for skipping forward or backward by 1 second. Only frame by frame or +/- 5 frames. Personally, I rarely used that shortcut when I was on FCP7 and prior. Only when clients said something like, "Skip forward 5 seconds," or something. Instead, I use JKL for scrubbing around clips.
If you would like to have the +/- 1 second keyboard shortcut, make a request:
http://www.adobe.com/go/wish
Kevin Monahan
Sr. Content and Community Lead
Adobe After Effects
Adobe Premiere Pro
Adobe Systems, Inc.
Follow Me on Twitter!