Been a crazy day, but here are some random thoughts for you. First from Shadowrun
Alternative Rule-All nighter-when you have a skill challenge where a check constitutes a day, you may make two checks per day. Each day you make two checks, you take a -2 dice pool modifier from exhaustion. After you stop taking extra checks per day, the penalty is reduced by 1 for every day you only make one check until the penalty is 0.
Here is a feat for DnD Next-
Critical Advantage-When you make an attack with advantage and roll the same value on each die, the result is considered a critical hit if the attack would normally hits the target.