A Question about MPLUS without SIMP flag

Hello,
 
i have a question about the Lisp interface of 
Maxima.
for eg.:
    In Lisp     
                (defun $test(expr)
                    (print expr)
                 )
    In Maxima    
                test(a + b);
    Output      
                ((MPLUS SIMP) a b)
    Expectant output                ((MPLUS) a b)
Does Maxima always change the format of Inputs to 
((FunctionName Flag) parameters)?
How can i get my function of Maxima without simplification in 
Lisp?
 
Thanks.
best regards

sven
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