It is very basic and does not even come with a config file

There is also nothing to exit, kill -9 -1 does it

nano /home/$USER/.config/weston.ini creates one. Copy something as the following into it:

[core]
xwayland=true

[keyboard]
keymap_layout=ch

[launcher]
icon=/usr/share/icons/gnome/24x24/apps/utilities-terminal.png
path=/usr/bin/weston-terminal

[launcher]
icon=/usr/share/icons/hicolor/24x24/apps/firefox.png
path=/usr/bin/firefox

weston can also be started in a X11, it opens then as window. echo $XDG_SESSION_TYPE will then be x11

Sway comes with the config file /etc/sway/config that needs to be copied to /home/$USER/.config/sway/config and edited

input * {
    xkb_layout "us,de,ru"
    xkb_variant "colemak,,typewriter"
    xkb_options "grp:win_space_toggle"
}

input <identifier> xkb_model "pc101"

it includes

include /etc/sway/config.d/*