Since moving to SL, I seem to have lost modifier-only activation (except when Quicksilver is already in the foreground).
I'm not actually sure the problem is the upgrade, though; I also had a bad crash and a new logic board installed in the MBP I'm using, so it could be I have a problem with System Accessibility settings or some other unrelated thing that's changed since the resurrection. But: double-Command was my friend, and I miss it.
