there are many ways to like that
Typically when appear weapons motions that is under the control of weapon.dat and iscript.bin
first off, it can make to similar with weapon.dat editing
if cooldown time be faster then would be play to like similar that
but that is not enough to mind
to make more effective u have to edit script
marines:
add Attack opcode 2~3 times and should insert " wait #" values as u want between each Attack codes
then will playing looks multiple shot in one breath
if u not figure out that exactly then try with reference to Valkyrie's Script
firebat is do like as remarked above
firebat has attack use with differece opcode but basic using opcode form is similar
i would not give answer to u totally and exactly...that why is for rising of ur power
but i gave u almost solution.....