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This one function is 300 lines of code!
If the tasks involved with the function were broken into smaller functions that could be overridden, then extending this plugin would be a breeze... However, if you want to extend the month output and alter it just a little bit, you have to re-write 300 lines of code. It would be great if some of these functions were smaller so they could be extended without such a headache.
I see theme functions in there which is great, but sometimes when building a module that extends a module, using the theme layer just doesn't cut it.
Take it or leave it I'm just throwing it out there.