Now, I do not wish to detract from the wonderful job the FFG team did in representing our favorite quasi-religious space warriors in an rpg, but, somethings seem to missing. A reminder, these are just my opinions, albeit exceptionally well reasoned. Here are some additional skills/talents that I'm going to have my Deathwatch players start with:
Pilot (Personal)
All Adeptus Astartes seconded to the Deathwatch start with this skill, as, in my most thoughtful and considered opinion, no chapter would send any marine with less experience than that of a tactical marine. Given that a tactical marine must, by definition, have progressed through a tour as an assault marine, it just makes sense that every Deathwatch marine would have this skill. Weird outliers such as Space Wolves, who do not follow the Codex Astartes, I summarily dismiss. Maybe they had to wrangle a squad of Sky Claws once, who knows?
Chem-Geld
I know this has been brought up before, and I'm in the camp that says the Adeptus Astartes, thanks to their extensive hypno-indoctrination, simply do not think about or even care about anything as filthy and debased as physical reproduction. Now, I can't point to any specifics here, but I'm fairly certain an Astartes does not even possess external genitalia anymore, thanks in part to the Black Carapace. I mean, for a warrior, that's just a huge weakness right there.