OK, after going through numerous threads, including the "dragoon flagship" thread in the fed fleet yards forum, I am leaning towards a beam boat (my experience has been tac / raptor $ escort, with a fed lv 47 eng / cruiser). This will be for some PvP, and normal STFs, mainly solo play otherwise
1)Benefits between Eng and TAC captain?
-Tac - Tactical initiative reduces CD on TAC skills
-ENG - Extra survivability, extra EPS skill, and train my own ENG BOFFS
2)IOther then 2xEPTS and 2xEPTW for content max weps and shields, what other eng skills would be recommended?
-EWP - extra dmg and slow the enemy
-Xtend shields - make the team happy
-A2SIF - hull heal
-Does SS Threat really do much in STFs?
-Does SS Subsystem Repair do much (I know more crew means faster repair)
These are the only skills suggested in the Dragoon Flagship builds that I am not too sure on
4) Any other threads that have good info on beam boats?
My Klingon flies a Raptor, but my Fed flys a Sovreign (Torp, 3x Beam Array Fore and Aft) so that's where my beam boat exp comes from. I run max power to weapons. I got 125 power there. I will never be in a situation where my weapon power drops to a point where it would be worth it for EPtW.
Unless you intend to run full power to shields... than buffing weapons with EPtW would make sense but I find it easier to go the other way. Especially because in Solo PVE I often don't need to even touch the EPtS at all.
A2SIF is only good with high Aux or popping batteries. I prefer Hazzard Emitter (with batteries)
What I run, Tac speaks for itself, swap whatever to what you prefer, Eng is all about survivability but I use 2 enemy debuffs in rotation. Aceton Beam and Boarding Party. My role is a tank in Elite STF, this is not a PVP build. To be Honest with the superior turning of a Vor'cha you may be better off running Torp, DC, SC, SC. at the front and 4 Turrets at the back.
Ensign - Tac Team 1
Lieutenant - Fire at Will 1, Topedo Spread 2
Lieutenant Commander - Emergency Power to Shields 1, Engineering Team 2, Direct Energy Modulation, Aceton Beam 3
Commander - Emergency Power to Shields 1, Boarding Party, Reverse Shield Polarity, (Extend Shield Strength as 4th skill in case I want to swap them around.)