Actually, giving the talent Enduring Winter the same ability of "Perma-pet" is quite enough. Solution would be, increase the mana cost of freeze so the smart mage knows what time to use it, and the stupid one spams it running the pet oom in maybe what, on second Freeze?
Freeze is only OP on PvP aspect for shatter combos, which with new frozen core talent made easier to do, and also might cause some ice lance spam for the proc of it. (Good luck critting with 20% crit chance on a Resilience-cap target.)
Perma Pet won't be as imba as people make it out to be. It's still squishy, has a long cast time, and with unspammable Freeze, (also has its own 25 sec CD), it's not immense. Sure, its still not something you can turn your back on, but it's not "U haz to kill ze pet first" either.
Glyphs is a nice way for Frost PvE. Frostbolt Glyph needs to be fixed, the snare removal is not good for proc talents, besides, Frost has too many good PVP glyphs to begin with, not many will take 5% damage over the other glyphs.
Also, I will say this again. Make Brain Freeze proc effective for Frostfire bolt too, its a good DPS boost for PvE, (On a long fight) and not so bad Burst potential for PvP. (6% from Piercing Ice, 5% from Arctic Winds, 10% from Chilled to the Bone. With lower coeff than Fireball, Frostfire won't hit for too much, certainly lower than the almighty 6k crit of Frostbolt anyway.)
I'm on a break. Yes. But damn I miss being good ol' frostbolt spam bot in PvE I know I know its boring, but I'm bored out of watching Arcane and Fire fly towards the enemy, I can certainly try out the Frost version