Could you specify wether these support physical keyboards? (showing only a toolbar when one is detected). I’m using the default proprietary Kika-keyboard on my device and it’s not great. Microsoft Swiftkey works but is not perfect and not FLOSS.

Also the “auto normalize” option (true by default and only shown in advanced settings) can mess-up with your source files. Mouting source files read-only won’t work either as it is creating files in source folders.