A few additional ideas:



Melee weapon master / Missile weapon master

These have five prerequisites each, including a level 1 talent. In order to justify this investment I would suggest they grant a bonus to the respective attack energy cost (in addition to the existing to-hit and damage)



Mechanically inclined

Grant a chance for the Pick Locks skill to not activate door traps



Very Careful

Grant its DV bonus regardless of chosen tactics (just as the DV talents Careful and Defensive Fighter do)