Why is it you cannot see firestorms within your scans? Seems a little weird you can see the character, but the storm of fiery ash and brimstone is completely absent from sight?
I do not know if this has been discussed or pitched already.
I doubt being able to see firestorms will gimp Invokers in any way, as most invokers during PK if they are still you can kind of figure they have a firestorm up already. But perhaps more to the benefit of those passing by who would like to avoid getting involved in a current PK match up. It's been often witnessed by myself that some may see a fight go on and sometimes walk into that invisible flaming storm and in worst cases deal a round of heavy melee damage to the invoker. It may of been possible said individual walks into a area spell and that's pretty unlucky, but firestorms are far more consistent, and are like blocks in the road for some and being able to visually see that may provide a little bit of benefit to the invoker also as people may avoid walking into it unintentionally.