Does it work the same way as rescaling an object or is there more to it?

If you want it to work right, you'll have to scale the unit's animations as well. Search is your friend.

Ok, I got it more or less. On a totally differant note however, I can't seem to get the geonosian to fly vey far, no matter what I set the fuel recharge to be he always flies for the same 30ish seconds... is there a parameter i'm missing.

fuel cost

JetJump = "8.0" //The initial jump-push given when enabling the jet
JetPush = "8.0" //The constant push given while the jet is enabled (20 is gravity)
JetEffect = "geo_wingsfly"

// the cool bit - Mike Z
AnimatedAddon = "WINGS"
GeometryAddon = "geonosianwings_folded"
AddonAttachJoint = "bone_ribcage"

JetType = "hover"
JetFuelRechargeRate = "0.340" //Additional fuel per second (fuel is 0 to 1)
JetFuelCost = "0.325" //Cost per second when hovering (only used for jet-hovers)(fuel is 0 to 1)
JetFuelInitialCost = "0.1" //initial cost when jet jumping(fuel is 0 to 1)
JetFuelMinBorder = "0.2" //minimum fuel to perform a jet jump(fuel is 0 to 1)

Doesn't that cover everything though? There is no fuel cost line. And the way I have it set up he should be able to fly indefinantly