'Already exists in steam account'

Okay so we have a syntax to check for whether its in your steam account, before entering into a contest... Would it be possible for us to have a check box of some sorts to filter out what games we cannot enter / already have?

My dilemma is that I scroll through a lot of games that I already own in order to find a few select ones that I wish to enter, I believe that the list of available game entries would almost half if that was the case.

It'd be a really nice feature, anybody here support this motion?