Add a class for styling the "-wrapper-wrapper" in a form

I ran across this issue...
http://drupal.org/node/564248

...and Wim stated that we can target the Hierarchical Select by targetting the .hierarchical-select-wrapper class. That's true, but when this module is used in conjunction with Content Taxonomy (actually not sure if this means anything at all), targeting .hierarchical-select-wrapper does not allow the title and description of the HS to be targeted. I'd like to add a simple border around each group. I've attached a screenshot. It is currently styled using .hierarchical-select-wrapper. I see there's an ID, in the following format, that would allow me to target the whole thing, but unfortunately it's an ID, not a class, and I'd like to just be able to target a class and have it applied everywhere.

Format of the ID: hierarchical-select-42-wrapper-wrapper
If we could get something like hierarchical-select-wrapper-wrapper added at the same level as the ID, that would solve the issue. Can this be added? I attempted to look at the code for the module, but I cannot find "wrapper-wrapper" anywhere in the files, which is strange, but if someone can tell me how to edit it, I could make the change now and wait for it to be implemented (if Wim will add it). :-)

Thanks so much, and if I'm missing anything, please let me know. This is one of my top 3 modules. I love it.