A few weeks ago, my old mouse's (MX518) middle-button started not responding properly. While I haven't got around to replacing it, I googled for a way to remap the side-buttons to a middle click ...

I've looked everywhere for a way to do this but can't seem to find one. There appears to be software that will do this for Windows, but not Mac. Basically I'm looking for a way to have it so that when ...