Tree comparisons

Hi, I am comparing two trees with a metric and would like to make a
background distribution of random trees. From there I could calculate a Z
score and p value.  I thought that the method to do so would involve
feeding Tree::RandomFactory isolate names and branch lengths from the
original tree. However, this class mutates the branch lengths according to
coalescent methods like Yule and does not accept random branch lengths.

So I'm not really sure where to go from there. Should I be using something
like Yule to make a background distribution of random trees? Or should I
implement a method to take random branch lengths from the original trees?

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