hi
you can request a wiki access and edit yourself
anyway, I suggest to create a second smecontribs7 repo with:
db yum_repositories set smecontribs7 repository GPGCheck yes MirrorList http://distro.ibiblio.org/pub/linux/distributions/smeserver/mirrorlist/smecontribs-7 Name 'SME Server7 - contribs' Visible no status disabled
signal-event yum-modify
in this way you don't have to alter your original repo list
my 2c