Make it more usefull. A static +4 is boring and less usefull at higher levels: So my proposal:
TOTAL DEFENSE
You receive your BAB as a shield bonus to your AC or your base REF bonus as a dodge bonus to AC. Choose when you declare the use of total defense. This replaces the standard +4 dodge bonus from CRB1 if that bonus would be lower.
ALL-OUT ATTACK
Counterpart to All-Out Defence, this manoeuvre is declared at the start of your turn and is the opposite of the all-out defence manoeuvre. You get a +2 bonus to all your melee attack rolls made during your turn, but suffer a -4 penalty to your AC until the start of your next turn.
INITIATIVE
Quick thinking and reaction are important for determining one’s Initiative. Add your INT-modifier to Initiative rolls.