Preroll should be able to be disabled

[jez9999]

So, I've just noticed that LICEcap has a "preroll" of 3 seconds. I was missing stuff of the beginning of my recordings because the only notification of this is small text in the status bar. First, the notication should be WAY more prominent. But second, there should be a way to disable the preroll. I just want to start recording immediately.