Include icons for games that offer local or online multiplayer (and maybe controller support?) visible on both the purchase page and wallet.
Just a quick visual reference, since it can be hard to keep track of all of them once you start to build up a collection, especially with Bonus games.
We have released our tagging system which allows devs to list things like this.
igs trauma commented
rarely will i buy a game without either lan multiplayer or without non-proprietary intetnets multiplayer
most bundle sites require tedtious stean/desura lookups to answer. please dont be one of those