Combining two effects into one would be a major feat for me as I don't know how to copy and paste effects as you mentioned. I assume using FXEditor.
I've examined the script in those fx files and don't understand the coding. Thanks anyway.
It isn't complicated...
Open the wake effects with notepad, copy the sections from one to another and renumber... All my wake effects are nested in this way. Remember the effect comes with a structure of three sections going together Emitter, Particle, ParticlesAttributes which need to be numbered in sets as you see from the example below. You can also add in e.g. navigation lights or smoke effects in the same wake effect file...
[Library Effect]
Lifetime=5
Version=1.00
Radius=-1
Priority=0
[Sound]
FileName=kkgasturb.wav
MinAttenuationDistance=20.00
Looping=TRUE
[Properties]
//Wake aft
[Emitter.0]
Lifetime=0.00, 0.00
Delay=0.00, 0.00
Bounce=0.00
Rate=1.00, 1.00
X Emitter Velocity=0.00, 0.00
Y Emitter Velocity=0.00, 0.00
Z Emitter Velocity=0.00, 0.00
Drag=0.00, 0.00
X Particle Velocity=0.00, 0.00
Y Particle Velocity=0.00, 0.00
Z Particle Velocity=0.00, 0.00
X Offset=0.00, 0.00
Y Offset=1.00, 1.00
Z Offset= -70.00, -70.00
[Particle.0]
Lifetime=30.07, 30.07
Type=21
X Scale=50.50, 50.50
Y Scale=50.50, 50.50
Z Scale=0.00, 0.00
X Scale Rate=0.04, 0.04
Y Scale Rate=0.04, 0.04
Z Scale Rate=0.00, 0.00
Drag=0.00, 0.00
Color Rate=0.11, 0.11
Fade In=0.10, 0.10
Fade Out=0.80, 0.80
Ground Normal=1
Shade=1
Face=1, 0, 1
Ground Decal=1
[ParticleAttributes.0]
Blend Mode=1
Texture=fx_wake_1.bmp
Bounce=0.00
Color Start=255, 255, 255, 180
Color End=255, 255, 255, 0
Jitter Distance=0.02
Jitter Time=1.00
uv1=0.00, 0.00
uv2=1.00, 1.00
X Scale Goal=90.00
Y Scale Goal=90.00
Z Scale Goal=0.00
Extrude Length=60.00
Extrude Pitch Max=90.00
Extrude Heading Max=10.00
// Wake bow
[Emitter.1]
Lifetime=0.00, 0.00
Delay=0.10, 0.11
Bounce=0.00
Rate=1.00, 1.00
X Emitter Velocity=0.00, 0.00
Y Emitter Velocity=0.00, 0.00
Z Emitter Velocity=0.00, 0.00
Drag=0.00, 0.00
X Particle Velocity=0.00, 0.00
Y Particle Velocity=0.00, 0.00
Z Particle Velocity=0.00, 0.00
X Offset=0.00, 0.00
Y Offset=1.00, 1.00
Z Offset=96.00, 96.00
[Particle.1]
Lifetime=20.07, 20.07
Type=21
X Scale=50.50, 50.50
Y Scale=50.50, 50.50
Z Scale=0.00, 0.00
X Scale Rate=0.15, 0.15
Y Scale Rate=0.15, 0.15
Z Scale Rate=0.00, 0.00
Drag=0.00, 0.00
Color Rate=0.00, 0.00
Fade In=0.05, 0.05
Fade Out=0.60, 0.60
Ground Normal=1
Shade=1
Face=1, 0, 1
Ground Decal=1
[ParticleAttributes.1]
Blend Mode=1
Texture=fx_wake_2.bmp
Bounce=0.00
Color Start=255, 255, 255, 160
Color End=255, 255, 255, 0
Jitter Distance=0.02
Jitter Time=1.00
uv1=0.00, 0.00
uv2=1.00, 1.00
X Scale Goal=110.00
Y Scale Goal=110.00
Z Scale Goal=0.00
Extrude Length=80.00
Extrude Pitch Max=90.00
Extrude Heading Max=10.00
//Green
[Emitter.2]
Lifetime=1.50, 1.50
Delay=0.00, 0.00
Bounce=0.00
No Interpolate=1
Rate=1.00, 1.00
X Emitter Velocity=0.00, 0.00
Y Emitter Velocity=0.00, 0.00
Z Emitter Velocity=0.00, 0.00
Drag=0.00, 0.00
X Particle Velocity=0.00, 0.00
Y Particle Velocity=0.00, 0.00
Z Particle Velocity=0.00, 0.00
X Rotation=0.00, 0.00
Y Rotation=0.00, 0.00
Z Rotation=0.00, 0.00
X Offset=3.40, 3.40
Y Offset=33.80, 33.80
Z Offset=-87.90, -87.90
Pitch=0.00, 0.00
Bank=0.00, 0.00
Heading=0.00, 0.00
[Particle.2]
Lifetime=0.00, 0.00
Type=19
X Scale=2, 2
Y Scale=2, 2
Z Scale=0.00, 0.00
X Scale Rate=0.00, 0.00
Y Scale Rate=0.00, 0.00
Z Scale Rate=0.00, 0.00
Drag=0.00, 0.00
Color Rate=0.00, 0.00
X Offset=0.00, 0.00
Y Offset=0.00, 0.00
Z Offset=0.00, 0.00
Fade In=0.00, 0.00
Fade Out=0.00, 0.00
Rotation=0.00, 0.00
Static=1
Face=1, 1, 1
[ParticleAttributes.2]
Blend Mode=2
Texture=fx_2.bmp
Bounce=0.00
Color Start=0, 200, 50, 150
Color End=0, 200, 50, 150
Jitter Distance=0.00
Jitter Time=0.00
uv1=0.00, 0.00
uv2=0.50, 0.50
X Scale Goal=0.00
Y Scale Goal=0.00
Z Scale Goal=0.00
Extrude Length=0.00
Extrude Pitch Max=0.00
Extrude Heading Max=0.00