I'm with Martin, I'd stay as far away from ROM Manager as possible. I just see way to many people having issues with it.
99% is user error. people start pushing buttons not knowing how it works and then they have problems.
Everyone of us that loves rom manager probably borked our phone learning rom manager and clockwork recovery. It's a superior system if used correctly.
As for the sbf files, which someone else mentioned: every sbf file I have used has some sort of recovery, whether it be stock or otherwise.... Who would package that file without a recovery? Sbf isn't any more deadly than a custom rom.... As long as you pay attention to what you are doing, you should be fine.
Nonsense and propaganda, before we know it someone will think the phone can carry a cold and pass that info along as truth.... Then half the forum will think the same, all because they read it on the internet.