I notice this since I start modding ver1.02 and It didn`t fixed all this way so I finally post this to give you notice and solution about this bug.
At now (ver 1.04) Marza`s missile barrage skill is completely broken since Sins released.
It fire missile effect very well but did no damage at all (or sometime do very minor damage (around 150) at the end of volley) instead of total 3000 damage.
I don`t know what this lines do exactly but changing this 2 lines in BuffMissileBarrageHit.entity will fix this problem.
onReapplyDuplicateType "ReplaceWithNewBuff" -> "StackNewBuff"
buffExclusivityForAIType "ExclusiveForAllPlayers" -> "NotExclusive"
-And also some minor bugs (?)-
Every passive persistence effect like Concentrate Aura and phasegate`s phase effect didn`t show up when you load saved game. (This can be fixed by changing instantaction to periodicaction(infinite) in lines that play buff effect)
Ships engine effect appear when they going to die. (looks weird to me)
Phase battleship captital need 200 crystal instead 250 to build unlike other capitalships.
Psi Planet psionic captital have 2 unusable weapon-1(laser) points (they points look forward but weapon itself have no forward damage)
Psi Colony captital`s plasma weapon have 1 forward damage (any use?)
Advent`s illusion Illuminator count as LRF (so at the endgame their build count go minus because bunch of dead clones...this may also happens in illusion fighter)
I hope this post should help find and fix those problems