1) for heroic you will be fine imo, although for pvp and +2 mobs you willlikely need 1 acc too.
2)SC is 35% base drain to all ranks up to EB at even level, as you go to GMs, AVs, MS and Hamidons you do not drain 35% base, its more like 5%, not sure hwo it works but they have huge drain resists as well as regen. (you arent gonna solo a GM put it that way). while slotting endmod is slightly viable, it isnt worth it other than in SC. TB is 50% base to even levels up to EBs although slotting this bad boy for drain is not the way forward.
3) see 2
4)CD is great at even levels and PvP, although for higher level PvE it wont really do anything due to the stealth suppression nerf, higher levels will bypass 3% odd defence far too easily (having said that, their base acc is the same within 5 levels now isnt it? so maybe im wrong, although bosses and things with tohit will cut through it, imo drop it unless u pvp/ghost). get trip mone and slot it for recharge and damage, pick up tp foe and you will be telemining yourslef through the nastiest of missions. i dont like to encourage too much conformity, but dev is a weak set, and this is prolly the only/best way to use the power imo. tazer? is that /dev, think it is, nice to have a stun, although tesla cage with acc hold hold hold recred recred should be a higher priority (for pvp and invince swap the 1st and last slot). for all you eelc stuff check my post on my own build on this board.
Plight
With regards to the targetting drone, despite Elec being quite an accurate set I would slot another acc in my powers to be comfortable.
I have found that Auto turret is a superb at taking aggro and you can use teleport friend to move it around.
Also combined with Super Speed, Cloaking device will make you fully invisable in PvE, allowing you to drop mines or the Auto turret up close (doing so does not suppress super speed 
) When dropping mines in a mob I often have caltrops queued up, altough I think caltrops does suppress Super Speed it is usually back by the time the mob gets up from the floor, chuck in Ball lightning then mop up any stragglers 
Later in the game you can often see Knives of Artemis etc wasting their caltrops against the auto-turret while they themselves are stuck on yours allowing you to blast from a distance 
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1) I have the targeting drone and its 3 slotted with to hit buffs, do I therfore need any further accuarcy in my powers or is the Drone enoungh.
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Chances to hit against Evens, +1s, +2s, +3s, +4s and +5s.
75 68 61 55 48 41 - Base
90 83 76 70 63 56 - Unslotted Drone
95 90 82 73 64 54 - 1 slotted attack for Acc ( SO )
95 91 84 78 71 64 - 3 slot Drone ( SO )
95 95 95 91 80 68 - 2 slotted attack for Acc ( SO )
95 95 95 95 95 86 - 1 slotted attack 3 slotted Drone ( SO )
So a 3 slotted Targetting drone is a tiny bit better than a single accuracy. My Ice/Dev has six slotted attacks with 3 damage, no accuracies and an assortment of recharge and end reds. The only accuracies I have are in Freeze Ray and Bitter Freeze ray because when a hold misses it is often life threatening.
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4) I only have Webgrenade, Target Drone, cloaking Device and smoke greandes from devices. Is there anything else worth taking from the Dev pool.
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I have the same and Caltrops on my Ice/Dev. Caltrops is very useful solo, but it not much use in teams, except perhaps as a barrier between you and the melee toons. Some people swear by the trip mines and time bombs. I prefer being a purely ranged blaster.
@Unthing ... Mostly on Union.
Ive decided to dust off Killer Watt my Lvl 34 Elec/Dev blaster who has being on leave since I6 came out so Im yet to make my post ED build.
I have a few question which I would like to ask.
1) I have the targeting drone and its 3 slotted with to hit buffs, do I therfore need any further accuarcy in my powers or is the Drone enoungh.
2) Which of my attacks from the electric pool drain the most enduarnce and is it worth slotting them with End Mods.
3) On the subject of end draining attacks, now that they are supposed to drain a % of the targets endurance it should in theory take the same amount of attacks to drain 100% endurance from a minion than it does an AV. (This is of course if we dont take regen into acccount). Is that correct?
4) I only have Webgrenade, Target Drone, cloaking Device and smoke greandes from devices. Is there anything else worth taking from the Dev pool.