FWIW, this is exactly how I do it, too. Give team B every opportunity to get it right, but if they really really want to kick, well, it will be a learning experience for the entire team. Or change the rules to have the coaches give the options.
I agree with you guys, after the deffered I'll ask : "I assume you want the ball..". It ain't always the kids or the ref that goofs. This occurred a few years ago with a new coach (NFHS):
Scene: Tie game, overtime 3 minute intermission, coach calls me over
Act I : COACH : "Ain't never done one of these before,, what's gonna' happen"

ME: "It'll start with a coin toss, winner can choose going first on offense or defense and end of field to play"

COACH : "Which is the best choice

"
ME: "Err. ,,,well, in baseball ,the team batting last knows what they have to do in extra innings

".
COACH : Ayah,'spect that make sense...."
Act II Turning towards captian, COACH sez' : "So if we win the toss, we'll go on offense
![Cool 8]](http://www.refstripes.com/forum/Smileys/classic/cool.gif)
!"
As captain and I stroll toward toward midfield, CAPAIN: "That ain't what ya' told coach,is it

?"
ME: "Just listen to your coach, son, just listen to your coach
![Cool 8]](http://www.refstripes.com/forum/Smileys/classic/cool.gif)
."
ACT III His team won

I knew that I never wanted to be a coach.
