What kind of features would you like to see in the Event Calendar?
mojoPortal features are largely based on community feedback. While I can't speak for Joe Audette (mojoPortal founder and chief developer), if you make a reasonable feature request, it will probably be included in a future release.
If you are not impressed by the look of the Calendars, I can assure you that it is quite easy to style them to your taste using the associated CSS. If you have trouble with the CSS, just post your questions in the Help With Styles forum. You are sure to receive help.