The Supergiants did actually start out as having the outer edges as storms rather than stars, but I decided that a massive star would have a huge energy output. I think at the time I made the change, SJ agreed and some IRCers agreed.
The sector damage should take care of ships trying to enter (ie no stellar construction or manipulation), although I did boost up the damage amount to make sure none would survive for the next version (as it was calibrated for my SFEmod).