The decision behind changing the default mappings for the keyboard and gamepad was fueled by the developers' experience with the video game industry. The mappings that are the new defaults more or less reflect the standard way video games are mapped. Our rationale was that with the upcoming release of Trident (and continued usage of the 2.x series) we wanted to give our new ROV users an experience that they might already be familiar with.
With that being said, we are definitely open to input from the community to tune these default mappings to maximize the flying experience. For example, auxiliary button mappings, such as LED toggle and servo tilt, are a hotly debated topic here at the office and we are still not sure if we have found the optimal configuration. If you, or any other community members have any ideas, please let us know!
Finally, if you really like the classic OpenROV mapping, we still have that preset available for you! Just navigate to the Input Applet (Top left hand corner->Inputs), click Load Preset (near the bottom of the page), select the loaded presets dropdown, and click OpenROV Classic. Now, whenever you boot up the ROV, you will have the Classic OpenROV mapping that you are used to.
Thanks for your input! Happy exploring,