I don't know if that was mentionned elsewhere but it just occured to me that you'd be better off by buying the enhanced system (beam weapons) edge than the pulse trait upgrade- both cost the same (5 pts of space)- but the pulse trait gives a +1 at the shortest range yet a -1 penalty at the two other ranges, while the enhanced system (weapons) edge gives a +1 bonus at any chosen range without penalizing the other range brackets.
For instance, if you have phasers at 4/4/4/0/0 and you add the pulse trait you end up with phasers at 5/3/3/0/0. If you use the enhanced system (beam) instead you end up with a penetration value of 5/4/4/0/0.