Repeat Last Command? (Equivalent to F4 in Powerpoint?)

Hello, I am an advanced user of Keynote '09. I have the following shortcut/hotkey question:

Is there a short cut to repeat the last command you did? In all Microsoft Office programs, if you hit the F4 key, it will repeat whatever function you last did...

Just wondering if something like this exists in Keynote (if it doesn't, then it ought to be developed for the next release!)