One of my company's auditors had forwarded me the following suggestion for future Collector builds:
"I would like to offer a suggestion that will enhance field collection performance while using a digitizer pen with Collector. If we were able to use zoom in and out commands on downloaded (OnDevice) maps, we would greatly increase our field efficiency.
As of right now, we can only zoom while using the touch screen. Very few [of our currently deployed] tablets still have a functional touch screen, so most auditors are closing and reopening the program to zoom out. If there were "zoom in" and "zoom out" buttons available on the map screen, it would be quite helpful."