One thing I forgot to mention.

IMHO testing for $PAGER as in

  ,----[ /etc/skel/.zshrc ]-
  |   +if check_com -c $PAGER ; then
  `----

which originated from the same test with most, is _not_ necessary,
since $PAGER gets definitely set.

  ,----[ /etc/zsh/zshrc ]-
  | +(( ${+PAGER} )) || export PAGER="less"
  `----

Arguments for keeping it? (o;