This might do the trick:
Yes, it says "java", but it works in Flash Builder, so it may work in Coldfusion Builder just as well.
Afterall they're all just Eclipse variants.
Yup you're right. Doesn't work for ColdFusion and if a similar option like the one for Java isn't available under the ColdFusion preferences I'm afraid there's no way to turn it off.
In that case you could file an enhancement request.
In case you do, post it here so people can vote for it