I am not sure to understand your question. But a simple answer is if you don't supply argument it will use optional parameters.
getOutliersI(y, rho=c(1,1), FLim=c(0.1,0.9), distribution="normal")
So here it will use a normal distribution with parameter rho=c(1,1)
and FLim=c(0.1,0.9
to compute Gaussian limits.