Mapache
Explorer
How I deal with MoG:
DM: "Is that the end of your turn?"
P1: "yes."
DM: "P2, you're up, btw the resist 5 is gone"
P1: "wait, I sustain minor!"
DM: "I asked if that was the end of your turn and you said yes, no sustain"
I don't let players sprinkle in damage after thier turns end from stuff they forgot, unless it was attatched to a feat or something. I hold the same to my monsters, if I forgot to do X, the players benefit. If a player can't say at least "Sustain minor" before end of turn, they lose it.
Of, course, i'm playing a psychological game by asking if they end thier turn, hoping that in the rush, they forget that small detail.
Yeah, I generally find that GMing like an antagonistic jerk and trying to trap players into Gotcha! with no takebacks is an excellent way to tone down player effectiveness. Sometimes it even keeps them from showing up to the game in the first place!