The Wizard Community is asking for a buff to Teleport since quite a while, because Teleport is only a mediocre Movement Skill at best.
Doing this via a rework of the Firebird set only benefits Teleport in Firebird builds, but does nothing for other builds.
I think that putting Teleport into the Firebird set will not solve the actual problem and only create additional work for you (the devs) in the future.
Maybe you can do something else with the Combustion stacks than letting them reduce the Cooldown of Teleport, and you probably have something in mind already what could be done with the Firebird set (especially after the mostly underwhelming feedback the rework of the set got), but I have some suggestions for how to improve Teleport:
Teleport
2 Charges
Each Charge has a Recharge Time of 8 seconds.
^^ the Monkās Movement Skill Dashing Strike also has 2 Charges with a Recharge Time of 8 seconds each, so I guess these numbers are okay. ^^
Wormhole Rune
Adds a 3rd Charge.
Reversal Rune
Replace with another rune that makes ot so that Teleport costs 30 Arcane Power instead of having Charges.
Suggestion: this new rune could be called āAetherwalkā, because it kinda fits.
Illusionist
If the mechanic of resetting the Cooldown of Teleport would become problematic with changing Teleport from a Cooldown to Charges, then Illusionist could gives Teleport e.g. ~20% Cooldown Reduction and ~20% Resource Cost Reduction, instead of resetting the CD, but that is just a suggestion for a problem that I donāt even know exists, so I am mentioning it just in case it comes up.
Aether Walker
Rework the special affix to āDeal 150% increased damage for 5 seconds after you used Teleportā.
The Oculus
This item current has a blue affix on it that reduces the Cooldown of Teleport by 1-4 seconds, which eventually would be problematic when changing Teleport to Charges or reducing its base cooldown, so maybe to disable old versions of this item, the special afix of older versions needs to give something like +100 Level Requirement.
The special affix can be reworked on new versions of this item to something like āTeleport gains the Safe Passage runeā.
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I know that I donāt speak for everyone in the Wizard community and so it might be appropriate to mention another alternative that some other players favor over Charges or a Cooldown, which is to let Teleport cost 30 Arcane Power.
In the end, how you change Teleport is up to you (the devs), but upgrading Teleport is something that is definitely welcome.
Thank you!