I've been on a BTL-A4 TLT kick recently. I've run it with Hired Guns as well as Drea Renthal, popping stress like mad to acquire Target Locks over and over. I started to think on my Rebel options, and looked immediately to Horton Salm. He gets the re-rolls that Drea gets, without all the stress shenanigans. PS8 is also nice.
First off, why BTL-A4? One extra 2-dice primary on top of 2 3-dice Secondary attacks seems a little weak for giving up the turret flexibility. The damage cap on the Secondary attacks opens up some interesting considerations, though, depending on your target. Against AGI 0 targets, especially if you have a Focus to boost the attack, you're likely to get an extra damage, maybe two. That's a 50-100% damage increase. Against AGI1, 1 extra damage is more likely, but that's still an extra 50% damage. 1 Damage is actually a lot in X-wing. Against higher AGI stuff, you're struggling to hit more, so you can get mileage out of every extra chance at damage that you can get. Furthermore, if you expect to face high AGI Autothruster ships, the shots outside your front arc are going to be less effective, so you can double down on your ability to bring targets in arc by going the BTL-A4 route. Finally, in early rounds of combat it's easier to get things in arc, so by taking the BTL-A4 title, you're trading late damage for early damage. You get more shots earlier, but fewer later ships move past each other. Whether this exchange will be worth it depends on how well you can leverage that early damage into earlier kills.
The base Horton for this build is simple, TLT+Horton+BTL-A4: 31 points of jouster. There are a number of interesting options, though. R2 Astromech is always useful. R2-D6 for an EPT is especially interesting. You could add VI to get to PS10 and screw with Arc Dodgers. This option could get a lot of use out of an Engine Upgrade, but that starts getting pretty pricey. You could go with Marksmanship to get re-rolls on blanks and hits on eyes, and maybe even make a crit work for you off the Primary attack. That's a 35 point build, but is action dependent. You could also go Wired for 33 points and stress yourself on your first move to get re-rolls on both blanks and eyes when attacking, or just use a Focus and let Wired kick in more naturally after you K-turn or pull a hard 3.
All of these ideas have merit on a non-BTL-A4 Horton with TLT, I think, but the title makes for an interesting ship that really can focus a lot of firepower early.
What are your thoughts on this sort of ship?