Default laptop key set to capslock. Keys that can be set to fenrir key or script key selectable via checkbox.

README.md

@@ -164,7 +164,10 @@ Use `--keyboard-layout laptop` with either mode to select the laptop layout.
 
 ## Basic controls
 
-The Fenrir key is Insert, Super/Windows, or keypad 0 with NumLock off.
+The Fenrir key is Insert, Super/Windows, or keypad 0 with NumLock off in the
+desktop layout. The laptop layout uses Caps Lock instead of Super/Windows;
+Insert and NumLock-off keypad 0 also work. Press Shift+Caps Lock on its own
+to toggle capitalization in the laptop layout.
 Hold it while pressing the other keys in a shortcut. Bare keypad review keys
 also require NumLock off.
 
@@ -213,6 +216,11 @@ Space toggles checkboxes; arrows change selections and numeric values. Activate
 The menu includes speech, sound, reading, keyboard, clipboard, and other
 settings. Speech rate, pitch, and volume use a scale from -100 to 100.
 For speech rate, Up and Down change the value by 10; Left and Right change it by 1.
+The keyboard layout combo box offers Desktop and Laptop. The Keyboard tab also
+has separate Fenrir-key and script-key checkboxes for keypad Insert, Insert,
+Caps Lock, and Super, plus Compose for scripts. Uncheck a key in one group
+before selecting it in the other. At least one Fenrir key must remain selected.
+Key assignments take effect on the next launch.
 Backend, device, keyboard layout, sound theme, and other launch-only changes
 take effect the next time Fenrir starts.
 
@@ -269,7 +277,12 @@ Keyboard layouts are separate TOML files. Named layouts are searched in the
 user's `keyboard/` directory beside `settings/`, then
 `/etc/fenrirscreenreader/keyboard/`, then the checkout's bundled layouts.
 Root uses the system and bundled locations. `--keyboard-layout PATH.toml`
-selects a file directly.
+selects a file directly. Layout files can set `fenrir_keys` before their bindings;
+the available names are `INSERT`, `SUPER`, `CAPSLOCK`, and `KP0`. The bundled
+laptop layout uses `["CAPSLOCK", "INSERT", "KP0"]`. An explicit
+`keyboard.fenrir_keys` setting overrides those defaults; its names use the
+`KEY_` form shown in [settings.toml](config/settings/settings.toml). Existing
+script-key assignments are excluded from implicit Fenrir-key defaults.
 
 Speech drivers are `speech-dispatcher`, `dectalk`, `dectalk-usb`, `litetalk`,
 `doubletalk`, and `tripletalk`. Serial drivers need a device path. The Speech