%T - Returns the current target.  (for example if you hotkey "/g I am heading in with a %T in hot pursuit" the Mob you have targetted will be filled in for the %T) 
%S - Returns the subjective gender-specific pronoun for the target (He, She, It). 
%O - Returns the objective gender-specific pronoun for the target (Him, Her, It). 
%P - Returns the posessive gender-specific pronoun for the target (His, Her, Its). 
%R - Returns the race of the target (only works on Player characters).