I'd go for something like:
---------------------------------------------
Exported from Ver: 1.7.5.0 of the CoH_CoV Character Builder
---------------------------------------------
01) --> Block of Ice==> Acc(1)Hold(3)Hold(3)Hold(5)Rechg(5)Acc(34)
01) --> Thorny Darts==> Acc(1)Dmg(15)Dmg(17)Dmg(19)
02) --> Skewer==> Acc(2)Dmg(9)Dmg(17)Dmg(19)
04) --> Fling Thorns==> Acc(4)Dmg(7)Dmg(7)Dmg(9)EndRdx(40)
06) --> Hurdle==> Jump(6)
08) --> Combat Jumping==> Jump(8)
10) --> Impale==> Acc(10)Dmg(11)Dmg(11)Dmg(15)
12) --> Ice Slick==> Rechg(12)Rechg(13)Rechg(13)
14) --> Super Jump==> Jump(14)
16) --> Aim==> Rechg(16)Rechg(34)Rechg(37)
18) --> Health==> Heal(18)
20) --> Stamina==> EndMod(20)EndMod(21)EndMod(21)
22) --> Thorn Burst==> Acc(22)Dmg(23)Dmg(23)Dmg(37)EndRdx(40)
24) --> Hasten==> Rechg(24)Rechg(25)Rechg(25)
26) --> Glacier==> Acc(26)Hold(27)Hold(27)Hold(31)Rechg(31)Rechg(31)
28) --> Arctic Air==> EndRdx(28)EndRdx(29)EndRdx(29)
30) --> Thorntrops==> Rechg(30)Rechg(34)Rechg(37)
32) --> Jack Frost==> Acc(32)Dmg(33)Dmg(33)Dmg(33)Hold(40)
35) --> Ripper==> Acc(35)Dmg(36)Dmg(36)Dmg(36)
38) --> Thorn Barrage==> Acc(38)Dmg(39)Dmg(39)Dmg(39)
---------------------------------------------
IMHO 2 acc, 2 hold, 2rchg in Glacier. its ACC isn't that good, with such a long recharge and short duration you need more hits on it. Tried 3 combos for it before I settled on that one. It seems the most eficient
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
Same for Block of Ice really - any hold in fact!
2 ACC 2 HOLD 2 RECHARGE ist he way to go
@Under Control
[ QUOTE ]
IMHO 2 acc, 2 hold, 2rchg in Glacier. its ACC isn't that good, with such a long recharge and short duration you need more hits on it.
[/ QUOTE ]That's what aim's there for 
Care to critique my build - same powersets, just so happened I was bored at work this week (what's new there!) and toyed with this....
---------------------------------------------
Exported from Ver: 1.7.5.0 of the CoH_CoV Character Builder
---------------------------------------------
Name: Cold Spine
Level: 41
Archetype: Dominator
Primary: Ice Control
Secondary: Thorny Assault
---------------------------------------------
01) --> Block of Ice==> Acc(1)Hold(3)Hold(3)Rechg(5)Hold(5)
01) --> Thorny Darts==> EndRdx(1)Dmg(7)Acc(25)
02) --> Skewer==> EndRdx(2)Dmg(9)Acc(25)
04) --> Frostbite==> Acc(4)Acc(7)Immob(17)Immob(19)Immob(19)
06) --> Arctic Air==> EndRdx(6)EndRdx(9)EndRdx(11)ConfDur(11)Fear(31)
08) --> Hover==> EndRdx(8)
10) --> Impale==> EndRdx(10)Dmg(13)Acc(27)
12) --> Ice Slick==> Rechg(12)Rechg(13)Rechg(15)
14) --> Fly==> EndRdx(14)Fly(15)Fly(17)Fly(33)
16) --> Swift==> Run(16)
18) --> Health==> Heal(18)
20) --> Stamina==> EndMod(20)EndMod(21)EndMod(21)
22) --> Thorn Burst==> EndRdx(22)Dmg(23)Acc(23)Rechg(37)
24) --> Shiver==> Acc(24)
26) --> Glacier==> Acc(26)Acc(27)Hold(29)Hold(29)Hold(31)Rechg(31)
28) --> Thorntrops==> Rechg(28)
30) --> Grant Invisibility==> EndRdx(30)
32) --> Jack Frost==> Rechg(32)Dmg(33)Rechg(33)Rechg(34)Acc(34)Dmg(34)
35) --> Ripper==> Dmg(35)Dmg(36)Dmg(36)Rechg(36)Rechg(37)Acc(37)
38) --> Thorn Barrage==> Dmg(38)Dmg(39)Dmg(39)Rechg(39)Rechg(40)Acc(40)
---------------------------------------------
01) --> Sprint==> EndRdx(1)
01) --> Brawl==> EndRdx(1)
01) --> Domination==> Empty(1)
02) --> Rest==> Empty(2)
---------------------------------------------
Comments most welcome
Ah use Aim the same way I use Power Boost, to make Glacier worthwhile........... fair enough
And black of ice only needs one, seriously, group holds have an acc penalty which requires the second. Cant think of any other dominator power that would need 2 accs appart for the group hold. Unless you plan on a lot of PVP
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
Frostbite for another attack I think, the fear in AA for a slow duration.
Frostbite and Ice Slick dont work together, you'll have ice slick for most fights, would rather take something I could use to build up domination than an imo that will stop knock down.
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
Personally I would ditch thorn burst, damage is pretty bad, debuff is pretty bad, agro creation is pretty good tho.
I think confuse durations make the most difference in AA. I don't like slotting for slow much because it only affects running speed, not -recharge. And you can't slot it for fear, that's some kind of bug in the planner I think. I have 2 confuses in mine now and I'm definitely seeing more shooting each other 
Its an unusual mix, but I thought I'd give it a try, but I've never played a dominator before - any help greatly appreciated