I play games on multiple PCs, around the house, when I travel, sometimes at work and love the Steam cloud save feature. It would be great if the Steam version supported this.
Alternatively/additionaly for non-Steam users, the ability to specify the save game location upon install would be good. This way you can point it to a Google drive or another cloud synced folder for seamless save game goodness across machines.
A simple feature that is ever so useful.