Use the wiki Configuration-Example for exwm-input-simulation-keys

[a-schaefers]

This way, C-s and C-y works [by default] the way we expect in applications such as web browsers, etc. This is the killer EXWM feature and sets it apart from other window-managers, and thus should be a default! :)

[ch11ng]

I'm afraid some users may simply use the default simulation key configuration and this change can affect and confuse them. Besides IMHO the CUA keys are less universal so I didn't make them default. For instance C-w is handy for closing browser tabs and killing the previous word in terminal simulators.

[medranocalvo]

I agree with @ch11ng. Nevertheless, it migth be helpful to new users to add them commented.