You could add "_F180" or "_180F" to your filenames (you can use a space or hyphen instead of an underscore if you prefer) to make the player load stereo fisheye automatically. There are free bulk rename apps out there that can do this for multiple files at the same time.
For presets, first click on the global settings button, and then add a preset. Notice the 5 buttons on the right of the preset (a circular target button, and 4 arrow directions). Click the circular target button next to your preset so it's highlighted in purple. Now, hover over the global settings button and then click the thumbstick to quickly load your preset. You can also assign presets to thumbstick directions. Just click on the arrow with the direction you want to assign. When you hover over the global settings button, hold the side grip button, then move the thumbstick to the direction you assigned. It'll load that preset.