I was talking about halving the difficulty after 20 minutes without finding a block, so from (say) 500M to 250M instead of the current 1.
I'm sure you'd have people rushing to submit 20 mins + 1 second blocks they had already solved. *shrugs*
I think removing the 20 minute structure period would prevent all of this.
It's a rush to race against that timer, make the timer go away and the network should flow(?)