Oh, right, that! Yeah, I never really made much use of it, because my fleet comps are pretty much always missile-centric, and the only reason you'd really need to fiddle with that is if you're pulling off some really close kiting. There's only one specific class of enemy I intentionally engage with energy weapons, and they move too slowly to be concerned with, at least if you've got the proper specialized type of ship for dealing with them.
That aside, E/KW engagements tend to be fairly one-sided if there's any sort of substantial tech difference, which is one of the reasons I stick to missiles early on: low-tech ships just plain don't have the armor to eat the sort of fire you'll take from energy engagements, and once you get to higher techs your E/KW sluggers are almost certainly going to be blobs of armor with guns strapped on. It's usually just simpler to charge in and smash faces, saving the kiting for missile ships. If you wanted to try your hand at it, though, yes, that's useful to tinker with.
I'm just a tad bit prejudiced towards a "reach out and touch someone" fleet comp, if I'm to be honest; my ships tend to be: LRM platforms with a range of upwards of 1b km, carrier groups servicing missile fighters (which at ~250t tend to be small enough to avoid detection even when they're only launching from 10-20m km), unarmed sensor ships of two types (a fast light cruiser carrying a single HS-50 16-res AS, and a cloaked frigate with large passive sensors), heavy battery ships with large numbers of shorter ranged ~250m km ASMs, and Macross-style frigates/FACs with mountains of box launchers. The only time I really build dedicated E/KW ships is for missile interception (groups of laser-armed ships set to area PD positioned between carrier groups and enemy ships, at least once I get decent laser range, and gauss-turret escorts), and heavy brawlers that are just fast enough to outrun Queens while blasting them with lasers from beyond meson range. That, and meson FACs if I'm being stupid and playing with Invaders on. :/