I've had the GWX Enhanced damage effects mod activated in JGSME for a while, but I never really noticed a difference.
Did some testing today with turning the mod on and off, and I can see no difference with the stock SH3 effects.
The smoke and explosions look the same, I see no oil slicks, and just don't notice a difference
Here's 2 screenshots;
With Damage effects
Without Damage effects
My Mod list is as follows;
GWX - No Medals on Crew
GWX - Lite Harbor Traffic
Magui F(Final()
TMT V2
Optional Stopwatch with speedlines for Magui
GWX enhanced Damage effects