The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
Is it possible to transfer the configuration of hotkeys to another account, for example, in one file?
You can share your game.prefs file, which should include the hotkeys, templates, selected mods (but you need to install them separately), video and audio settings, host settings and some more