This receiver plugin will add keyboard shortcuts to your OWRX+.
The plugin depends on notify plugin.
OWRX+ v1.2.67 has this plugin integrated, hence the plugin will not install, even if loaded.

To show help screen, press ?.
Add this line in your init.js file:
Plugins.load('https://0xaf.github.io/openwebrxplus-plugins/receiver/notify/notify.js');
Plugins.load('https://0xaf.github.io/openwebrxplus-plugins/receiver/keyboard_shortcuts/keyboard_shortcuts.js');
Learn how to load plugins.