Pedro it would seem to me that you have more of an issue with the power level of the spells created (Enemy of my Enemy) then how the actual mechanics for casting should work. That's more of a spell design flaw imo then a good basis for how the casting into combat rules should work.

Personally i don't think enemy of my enemy is that bad. Its high strain and speed and often creatures miss each other... and its only for one action. But perhaps that's another thread...

Solution:
I think the talents available should be able to provide the casters a reduction of the -4 penalty to fire into melee for all spells. However what i do propose is that casters do not get the +2 for casting into melee for having a tactical edge. As it makes little sense that they would.

~Tony

And I need to add a clarification that range attacks do you gain the tachtics edge when firing into melee

??

I think he means "Add a clarification that you benefit from Tactical Edge if you are firing at a target in melee that is granting Tactical Edge."

Correct,

There are two versions of Tactical Edge.

1) A target grants Tactical Edge. In this case, everyone attacking the target gains the benefits of Tactical Edge, regardless of weapon, spell, or range of attack. Cases where this occurs: The target is outnumbered, prone, blind, etc.

2) You gain Tactical Edge against a Target. In this case, only you gain the benefits of Tactical Edge against the target. Cases where this occurs: Attacking from concealment, invisibility, or due to specific maneuvers.

If a target is flanked, it is granting Tactical Edge to anyone who attacks it.

If a target is engaged with only one enemy, it doesn't grant Tactical Edge regardless of how many ranged attackers are firing at it.