One great feature I'd love would be to have a configurable list of key combinations which Parallels would ignore and instead leave for Mac OS to handle in whatever the default manner is. The most obvious use of this is for Cmd-Tab, but other combinations would be useful as well, depending on the user. For instance, I use Ctrl-Space to invoke QuickSilver, and I'd prefer to have that still operate while Parallels is in the foreground. Setting this up as a user-definable list seems like a general solution that should solve any of that type of problem.
