Here's a way to improve this skill for PvP without affecting PvE.
Add hard CC to Noxious Breath.
Similar to how NBs cause enemies to run in fear, DKs that breath toxic on ememies should cause them to panic and try to save themselves.
Why do I want to buff stamDK?
They are not at the top of the list right now. Only better than templars (poor templars. Such a cool class).
Would stamDK become OP with this change?
No the CC would not be a game changer.
I can still stun with reverb bash or fossilize, but I would like to replace them. Why? SnB, the only viable way to play stamDK is boring.
Fossilize costs magika. Add igneous shield, add FoO add perhaps Wings and you need to rethink your rotations .
Noxious Breath would make stamDKs a good addition to orginized PvP. Just like every group runs a magDK for talons, just like that a stamDK can use this AoE as CC. 2-3 targets maybe. Like NB.
Noxious Breath is an iconic dragonknight skill. It is even depicted at the artwork with the 2 DKs fighting each other that came out with IC. However being so weak, Noxious breath can be replaced with almost anything. This buff will make Noxious breath a viable skill, that adds to the classes identity.
Paired with the changes to combustion I believe that this will improve stamDKs in PvP without affecting PvE.
I think it would look rly cool to see enemies in flames running around