Asking for Kudos

In the sort of tech support I do we deal with sales reps nearly as often as out direct customers.

Sales reps, being largely the spawn of the devil, like to blame any customer dissatisfaction on tech support (no, it's not that you promised something we don't support, it's that we're recalcitrant and refuse to help the customer), so any of us winds up with a few complaint letters in our account. The thing is, sometimes we also save a sale or give a rep that little extra, which makes them happy. Unfortunately, human nature means that someone is more likely to write a letter of complaint than a letter of compliment.

When callers say things like "You're great - this was really above and beyond" or mention that they always arrange their support calls to make sure they get you because "You're the best support person we have", is there a good way to say "Great, could you write a note to my boss saying that?" I don't want to sound desperate for praise, or pushy, but the occasional compliment letter really can help during those performance reviews (not to mention merit increases).

So, anybody have any clever ways of asking for praise without, you know, sounding like you're fishing for praise?