It's possible. I never go into SP when I do WILD:s. I usually get to the numbness and lie still untill it gets real uncomfortable, then I turn on my side and I drift into the dream.
However this night I didn't have to turn to my side, I just flew into the dream right away.This happened after drawing inspiration from this article by adraw:
http://www.dreamviews.com/community/...ad.php?t=61525
I guess the SP comes after I'm thrown into WILD cause of course it happens sometime during the attempt cause it always happen when a person goes to sleep.