I'm set up with NCE Powercab interfaced with a laptop (Windows 10) and the JMRI program (4.18) and using Withrottle on a tablet. The laptop I'm using has a shorter/smaller up and down arrow and the larger right and left arrow. Like I was saying, not sure how hard it would be, but I would recommend the option to invert or give options in the program to allow a user to configure the arrow keys to their liking. I love working with this JMRI program!? Makes model railroading fun! But it sure is a different learning curve, especially for us novices.... ? ? (I finally figured out a control panel to work my 11 turnouts through my Q-Snap boards I installed.)
Roger Sanders