Thing is you will be inneficient.
Here some little info.

Maxed Firewall + Maxed Fire Mastery.

Firewall Damage = 3377-3439 per sec.

Maxed Frozen Orb Max + Maxed Ice Bolt + Maxed Cold Mastery.

Let's note you didnt even include Ice Bolt that give bonus to orb but i will to actualy make dmg higher.

Frozen Orb Damage = 366-387.

Ice Bolt Damage = 174-227.

Cold Mastery = Pierce 115% resist.

No matter what other skill you would take wouldnt help as they wouldnt actualy work good.

These damage would have been good in 1.09. But in 1.10 it is puny. Mostly since you cant cast firewall and orb at same time.
In 1.10 you can make a build with many skill yes ! But you will be extremly inneficient.


Now let's see why.
I will show 3 build. One of each element.

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For Fire Sorc.

Max Fire Bolt + Max Fire Ball + Max Meteor + Max Fire Mastery.

Fire Bolt Damage 885-1177.
Fire Ball Damage 3462-3931.
Meteor 6856-7314 and 678-739 per sec.

Since the synergy affect directly the other skills it will make any further points gained in Fire Bolt, Fire Ball or Meteor raise the damage of these spell extremly quick to eventualy make Fire Ball match Fire Wall and Meteor be on a class of it's own ! You can also cast Fire Ball during the time you wait to cast Meteor again ! There is also one other important thing. Meteor fire stay for 15 sec. and if you Meteor twice or more in the same area the damage per sec. will stack.

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Now for Cold Sorc.

Max Ice Bolt, Max Ice Blast, Max Glacial Spike, Max Blizzard, Max Cold Mastery.

Ice Bolt Damage = 385-502.
Ice Blast Damage = 1062-119 Freezes For 20.4 sec !
Glacial Spike Damage = 675-727 Freezes For 6.8 sec !
Blizzard Damage = 2280-2476.
Cold Mastery = Pierce 115% resist.

It's similar to a Meteor build. But in this one you completly freeze your enemy then use Blizzard followed by Ice Blast untill you can cast Blizzard again. Now that is efficient damage ! Not as much as fire but you get the freeze/cold lenght advantage.

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For the last, the Lightning Sorc.

Max Charged Bolt + Max Nova + Max Lightning + Max Chain Lightning + Max Lightning Mastery.

Charged Bolt Damage = 112-128 22 bolt.
Nova Damage = 495-710.
Lightning Damage = 3-5963.
Chain Lightning Damage = 3-3611 9 Hits.

So you can see, these are actual efficient character. Like any spell that benifit from Synergy the dmg will raise extremly fast with +skills items.