Steam is also completely broken on case sensitive filesystems. Currently I run a case sensitive partition and store my source and /usr/local directories there. That way all my development is sane, and the rest of the OS can be stupidly insensitive all it wants.
We're talking about Macs and, last time I checked, Steam won't even install on a case sensitive filesystem on the Mac (or Windows). They have to on Linux—there's no other choice.
