We never have before, however Dave used to look at them to make sure they were fair. Which trade were you talking about in particular?
EDITI should clarify. We have had owners in the past call into question trades that have been made. Dave would then review the trade and either allow it to stand as is or veto it. So, no you can't veto a trade but you certainly can voice your displeasure with a trade that has been made and it will be reviewed.