Can I disable the 3rd level?

I know it says to only download if you're helping with testing and development - and I would be happy to help with either of those. But this module does almost exactly what I need and the only other option was to develop my own that does this in the same way. It is working perfectly on my installation, exactly as expected. The only thing I am having an issue with, and there may be a way to make it work that I haven't discovered yet, is that I do not want to show the 3rd level deep. I could probably accomplish this using css but as the third (and will it show 4th? haven't tried yet) levels will become rather large, the result will be that it generates and outputs a lot of code that isn't displayed and this is a waste of time and processing power. Is there a way to configure it or a change I can make to the code of the module that will allow it to only descend as far as I need it to? In the final release I think it would be useful to add that as a module configuration option and if I can get it to work for my site I would see whether I can make it a configuration option and contribute the code back in, but although I am an experienced php developer I am new to the structures of drupal so am not sure where/how to make the change initially.