Hello,
On Mac OS X, the shortcut to Select All is command A, and the shortcut to Quit the application is command Q.
Thing to know :
The Mac keyboard command key is where the Windows keyboard Windows key is.
However, the corresponding Windows shortcuts are control A and control Q.
The problem :
In the SL client for Mac OS X, when you Select All (cmd A) the client quits (without notice).
It seems that the SL client for Windows doesn't have this bug because it was given the support for AZERTY keyboards.
Consequences :
This, is the most raging and frustrating thing in my SL experience, it is worse than griefers and spammers.
In addition, doing cmd A to Select All is a reflex (like most shortcuts) and since I had not to do cmd A in SL, I have developed a counter reflex in other applications (that yet are cmd A safe).
Select All isn't the only broken shortcut, there's also cmd Z that is supposed to Undo but seems to close the floater instead.
This request can rejoin this other post : Custom key remapping
and this proposal Keyboard remapping