I have used specifications (under fitings in the database) to define my connectors. You could make a real simple spec to just choose the default connector, but there are many other things to add as well. SUch as standard straight length and standard seams.

I myself use multiple specifcations to suit the job I am currently doing and it is controled also by duct size breakpoints. I find that half of the pattern options just don't work anyway.

Good luck, and let us know how you went.