Wirelessly posted (iPhone 4S: Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3)
As far as I know, all apps on iOS are equally spaced apart and cannot be changed.
(maybe in the jailbreak world this can be done)