custom comment model with manager for less sqlqueries

Hi,

I really like this package and wondered how you feel about this proposal.  

Currently, every comment from an authenticated user generates an sql query (as noted here: http://stackoverflow.com/questions/7887141/how-to-make-django-comments-use-select-related-on-user-field)

This proposal seeks to reduce queries by building the comment list with a select_related.

Alternatively, it might be better to define a plugin comment model and users can solve this as they please?