I'm about to start at shuttle coming from the 145 so I'll report back and let you know. I did have the opportunity to non-rev on Republic a few weeks ago and got a quick tour of the cockpit. One tidbit I picked up from the FO was that there is an "auto" switch for the bleeds and packs and the buttons are left in all the time. So I guess the answer is in the 145 everything you want is a button press away, in the 170 you don't even need to press the button.