RK and I had a test session with the new version (V6)
For the sake of RK's sanity, here are the things we noted:
Exp's:
For the Cybran land explosions, decrease the opacity of the leftover sparks, or decrease their lifetime. (Possibly add smoke)
Possibly fix the fact that the soul ripper (and asswasher?) uses some miniature explosion script if it explodes while it is landed. (Possible add unique explosion? Right now its using a scaled up air explosion.
Fix the explosions using the exact same code while underwater. (all factions)
Naval:
Fix Atlantis using fire emitters while it sinks underwater
Find out what the subs are doing and fix it...

EDIT: Time for some creative/personal preference stuff.
Cybran land Exps:The sparks that linger at the end of the cybran exp explosions are far too vibrant. I think it could look really cool however, if you turned down the opacity considerably, and made them slightly smaller, so they were almost barely visible.
It would give them a feel of "lingering energy" left over, but at the moment it just looks very weird and out of place
Also, I think some black smoke, similar to the stuff in the fatboy explosion should be added, the sparks/lightning is cool, but with more exaggerated smoke effects, it could look a lot better, right now the explosion seem slightly..... bare.
Also possible speed the explosions up? I'm really on the fence with this one, I think the length is fine personally, but I could see some other players possibly having an issue with it.
Aeon:GC:
I love it, I don't see anything specific that needs changing for this one, apart from maybe adding some debris, like the ones for the aeon ship and factory explosions, for the last explosion in the sequence.
UEF:Fatboy explosion is one of my favourites, not much I can add apart from adding more hi-res fire textures (if its possible)
Sera:Chicken:
I cant really think of anything to add/take away, considering there is an energy storm after it dies, if anyone else has any idea for this, let me know
All land exps:
Currently, after they finish exploding, no visible scorch marks are left on the ground. This seems very weird considering the scale of the explosions, you could probably just use the scaled up explosion marks that the SR/Czar uses when it crashes.
Also I know one of the explosions (GC I think) produces a dust cloud. Maybe add this to the final explosion from all the land exps.
Air exps:Possible to add some kind of explosion when they crash into the ground, especially considering how much damage they do.
Also maybe get the SR and Asswasher to spray out sparks as they fall down, not just trailing behind them, but similar to the sparky debris that the sera factories produce when they die.
I think we actuallly forgot to test what the czar looked like!
