On low-end systems (eg ATI X1250), there seems to be an high graphical performance hit from shield bubbles. This is a really low priority request, but if it's easy/cheap to do, I would appreciate a .setting file entry to disable shield bubble effects. It's not something most people would do, so there's no need for the effort to code it into the options menus.
Like I said, not a big deal, but if it shows up, it'd be nice (: