In my (admittedly ugly) package, I simply delete execline's `cd' and `umask'; `wait' is renamed to `execline-wait', just like `execline-cd' and `execline-umask' (which are not conflicting and so not deleted).
This means that your execline package cannot run execline scripts that use cd, umask or wait. It may work for you, but it is not suitable as a general audience package. -- Laurent
