Setting rotation default in Plato?

[tei]

I use my Elipsa almost exclusively in Landscape mode, so I would like to have both the file browser and the books in that mode by default. It seems that the stock firmware can only change the orientation on books, not the file browser, and KOreader seems to respond to the gyroscope for both browser and books but I can't find a way to ignore the gyroscope and stay put. In Plato, there is the option to disable the gyroscope and set a rotation angle that goes for both the browser and for books, yay! But it resets to portrait whenever it starts up again. Is there a way to set a default for this? In .adds/plato/Settings.toml it has a rotation-lock field that is set to "current", but I can't find any documentation on what that means or if I can set it to something else. (I tried just setting that to 270, but that didn't work and the file just reverted back to "current".)