[R] stop criterion for stepAIC

[Thomas Fischer]

Hello,

I am using the function stepAIC (library MASS) to run a backward 
elimination on my linear regression. The new model stepAIC calculates 
contains coefficients that have a Pr(>|t|) value below 0.1, but I'd 
like to have only coefficients with 0.001 or below.
How can I change the stop criterion for stepAIC, so that it is more 
strict? There is a parameter "steps", but it is only a upper bound of 
steps.

Greetings,
Thomas Fischer