Foot pedal - 3 buttons for dictate, field forward, field back, which are all the buttons I use on the Powermic anyway.
Amazon product ASIN B002MY6I7G
Importantly, this pedal is plug and play, so it works on work computers that are locked down / unable to install drivers.
Importantly, this pedal functions as global hot keys, so it activates dictate even when Powerscribe is not the window in focus (eg, you are clicking on the PACS). You don't get this with keyboard/mic shortcuts unless you install a program for global hotkey, which again may or may not be accomplishable on work computers.
At home I use the foot pedal and put a podcast mic or the powermic on an adjustable cellphone holder clamped to the desk.
One caveat I have noticed is that if you are wearing shoes and standing/shifting constantly, you may accidentally hit the wrong button. So it's best for sitting and/or not wearing shoes so as to able to feel the pedal with your foot.