Guard the point(s)? Cleverly move to a strategic location to pick off unsuspecting enemies as they exit a spawn room?
The answer is simple: at least one person guard each capture point; at least one person cleverly move to a strategic location to pick off unsuspecting enemies as they exit a spawn room.
Whilst that may seem a sensible suggestion - people should simply run from point to point en-masse as the point flips, resulting in a never ending game of Whack-a-mole which is just soooo much fun