I want to switch Tori and Uke's starting places ( so Uke stands where Tori is, and vice-versa), but I can't do it. Any help?

you can make the engagedistance -100 but they'll be facing away from each other.

Poptart did you forget about engage rotation? If you want to do it just write:
/set ed -100
/set er 180
and you will be done.