When I place a GTC order with my broker they cancel it at the end of each session and place it anew the next session. I use lots of limit GTC orders but no stop loss orders.
I had read the news earlier and wondered about their motivation. If their motivation is truly to prevent runaway markets then they should have no problem with limit stop orders. I was thinking they just wanted to save on the administration of stop loss and GTC orders. 
Denny Schlesinger