Could the next version of Emacs / elisp expose `exec` as a built-in elisp
function?

The Unix `exec` semantic is useful for Cask and other Emacs-related
programs, but is currently not accessible via elisp. If it were, elisp
programs could, for example, begin an Emacs editing session even though the
elisp program itself was originally run using emacs.

-- 
Cheers,

Andrew Pennebaker
www.yellosoft.us