[viellieb]

I've found a workaround.
It's tideous, but it works:

write an apple-script for all your perspectives as seen here:
http://heres-the-thing.posterous.com...orkflow-tweaks

    tell application "OmniFocus"

    activate

    end tell

    tell application "OmniFocus"

    tell default document

    tell front document window

    set perspective name to "Flagged"

    end tell

    end tell

    end tell

Save all scripts in one Folder, give every applescript the name of your perspective.

Add a Quicksilver trigger:
item: the folder with your perspective applescripts
action: "Inhalt durchsuchen" in german, should be something like "search contents" in english.
target: empty

now if you invoke the trigger, you just have to start typing the name of your applescript (=perspective), hit enter and you're done :-)