That actually makes going off the table not as appealing as some people would have you think. I didn't think outflanking, escorting or deep striking was allowed from Ongoing Reserves but it would certainly be an interesting concept. Having to return from your own edge is not so bad, given how far a Flyer can move and keeps an already powerful unit from being too powerful.
"Fetch me another plaything. This one seems to have broken." -Urien Rakarth
Space Marine- "This planet is ours, witch."
Eldar- "No ... This planet is theirs ..."