Tabby, the problem with doing as you suggest is not that the client goes away happy, it's that the client goes away believing that the item WAS deductible, when you should have educated him/her on why it was not. Not only for future, but also so they don't go around telling their friends "my tax preparer said it was deductible". Which, by putting it on that Sch A, you in fact did do.
I'm not talking about something that IS deductible, like our fees, work boots, or union dues. Sure, we all do that, if we are smart, just so the client sees we did take them into consideration. I'm only talking about the temptation to put on something that IS NOT deductble.