1st. thanks for Pester. I've used it for years. In a rant I wrote last year I said "One of the best apps ever. Why can’t more devs think this way?"
This is a feature request. Since aiming for radio buttons is hard, and so is manipulating them with the keyboard, could you make it so that clicking on the corresponding time entry control changes the channel on the radio?

i.e. click in the red and "in" becomes selected and click in the blue to select "at"