I think people have a really good point when they say a Ratling Sniper class is a tough sell for their height alone, because a character whose main purpose is hitting long-range shots is gonna have a tough time if they can’t see over all the waist-high cover – to say nothing of tallfolk getting in the way. Of course, if one were get to high ground or even stand on some boxes, height wouldn’t matter as much. That’s just not always possible.
Ratlings aren’t only known for being good snipers, though. They’ve got a whole section on the 40k wiki about their role as “trailblazers,” who use stealth to outwit their foes, or ambush them if it comes to that. In-game, I look at all this waist-high cover and think about how fun it would be to play a fast, wily little guy with a shotgun and a hatchet, weaving between all that junk and forcefully removing heretics’ kneecaps, or setting up traps in chokepoints. Plus, they’re a great candidate for a reject, given how often they’re accused of stealing, smuggling, and the like.
They could have some sort of stealth ability as their Career Skill, and a throwable trap as their grenade. (A bouncing betty? Electrified netting?) They’d probably be pretty good at reviving teammates safely if their stealth ability lasted long enough, and given how small they are, they might even be able to pass through enemies while their stealth is active. To avoid a VT2 Huntsman situation, though, I think their Career Skill would have to have some additional function – maybe stunning nearby enemies when stealth begins/breaks, or leaving behind a taunting decoy as a distraction.
Their weapons could include a ranged DoT weapon like a dart gun, and perhaps one with an alt-fire that has them toss a throwing knife, in addition to whatever they could borrow from other classes. (The revolver, maybe.)
Anyway, if Ratlings are at all in the cards, I acknowledge it’s probably gonna be awhile before we see them, given FS is doing crisis management right now. I just want to keep the idea afloat out here, and express my interest in that particular playstyle and flavor of power fantasy. I think there’s room for it, and I’d definitely shill out money for it.