The keyboard shortcuts are added as an advanced setting, meaning that you can manually set it in the quelea.properties file. We haven’t updated the wiki yet since we haven’t released the feature in a stable release, but you can see the information about how to use it in the pull request I created. Just ask if you have any additional questions about it.
Regarding the option to always show a translation, feel free to create an issue for it so that we can keep track of it. It should be relative easy to add, but I can’t make any promises as to when we’ll get to it.