Here is something I can up with for Devastators. It still needs to be play tested and balanced. Let me know what you guys think:
Deathwatch Heavy Weapons Specialist
Requirements: Rank 4, Marksman’s Honour, Marksman, Target Selection
Wargear: Fire Storm Multi-melta, half requisition for all heavy weapons ammunition
Special Ability: Shredder of armour
The Heavy weapon specialist is a master of bringing down opponent's armor. If he performs a called shot and succeeds in hitting the target, he brings that location’s armour down by half his unmodified BS (rounding up) for half his rank (rounding up) rounds.
Intimidate Special Use: Bolter Diplomacy
The Heavy weapon specialist lets his prodigious skill with his heavy bolter do that talking. As a half action he may attempt opposed intimidate test using his Ballistic skill vs opponents Willpower to shoot at the opponent’s viscinity. If he is successful the target is intimidated by the battle brother’s prowess. If the battle-brother fails his Ballistic Skill Check by 3 or more degrees he unintentionally shoots his target consider the every degree above 3 as an additional hit.
Advance Cost Type Prerequisites
Demolition 400 S
Demolition +10 600 S Demolition
Demolition +20 600 S Demolition +10
Tech-Use 800 S
Tech-Use +10 800 S Tech-Use
Tech-Use +20 1000 S Tech-Use +10
Eye of Vengeance 1500 T BS 50
Sharpshooter 1000 T BS 40, Deadeye Shot
Heavy Weapon Artificer* (x3) 2000 T Trade (Armourer) +10
Heavy Weapon Maester* (x3) 2000 T BS 60
New Talent: Heavy Weapon Artificer
The Battle-Brother is so accustomed to firing and maintaining his heavy weapons that through sheer rot he is able to make them function better. This Talent upgrades the battle brother’s standard gear or Signature Wargear weapon’s craftsmanship by 1 degree, so common becomes good, good becomes best. A particular weapon must be chosen. The same weapon can be chosen again or a different weapon may be chosen.
New Talent: Heavy Weapon Maester
The Battle-Brother knows the strengths and limits of his weapons. When firing a particular heavy weapon he gains +2 damage and +2 penetration with that weapon. This may be chosen again for a different weapon with a total of 3 heavy weapons.
I used the Intimidate specifically for one of my players. I know its not really WH40K vibe perhaps people could suggest something to replace it.