Provide an option for the space bar to be either next file or for screen down and for backspace to be previous file or screen up.
To my knowledge, space bar for screen down and backspace for screen up started with Netscape Navigator back in the days of Windows 3.1. The idea was that you could read web pages with your thumb to go down and your fifth figure to go back up if necessary. You didn't have to put your fingers on the keyboard or grab the mouse while reading a web page.
This basic idea has stood the test of time and applies to both viewer programs and browsers.
I have long used Macro Express to program my own shortcuts. However using a macro program for the space bar involves problems because you have to determine in the macro when to do a screen up and when to do a space. That is not always possible.
Provide an option for the space bar for screen down
Moderators: helmut, XnTriq, xnview