options.paths not used for transforms

Hi,
Is there any reason why you dont pass paths in loadTransforms?
I had some transforms installed in a separate directory referenced by NODE_PATH. node find them correctly but browserify not even if I pass that directory to the paths option of browserify.
I went down the calls until I found that the missing piece is to add paths: self.paths to the params variable in loadTransform.
By doing that, it now works but I don't know if this is the right solution.