One way is to press the Esc key to dismiss the highlighted input boxes
Or Tab to the next field. I can't say for sure that works in every situation, but it's what I tend to do.
Thanks R, I'm probably just spoiled by mac. I'm curious, does that even bother you? or it's just me
It's just the difference between how the operating systems window managers work.
You could use the scrubby sliders for the input fields in the tool options bar or press enter to dismiss the highlighted field and keep the value.
(esc resets to the last value)
I'm so used to it, i never really thought about it.
Windows does have some other differences in photoshop.
For example, in the layer styles/blending options dialog, one can use the scroll wheel on mouse to change blending options or any number of other drop-downs in that dialog