If you want it to overwrite old copies of spells to refresh timer set a one at end of command. Like casting Spirit of Wolf without overwriting old copies would be:
[CODE lang="ini" title="SOW without overwrite"]/mac BuffGroupOneSpell "Spirit of Wolf" 0[/CODE]
But if you want to update the spell on all your characters (Say you have 3 mins left on a couple), you would use:
[CODE lang="ini" title="SOW with overwrite"]/mac BuffGroupOneSpell "Spirit of Wolf" 1[/CODE]