1.1.3 Fuel Flow Modification

[Pugachev's Apprentice]

I've made plenty of stable and meta-stable rockets with stock fuel flow in my time, but while attempting a fully reusable career play-through I decided that this particular mechanic had to go. I'm aware of the workarounds using fuel pumps, tank locking, and even the TankLock mod being maintained by the illustrious linuxgurugamer:
 

However, what I would really like is for rocket engines to just behave like jet engines, having the "resourceFlowMode = STAGE_STACK_FLOW_BALANCE" property which causes fuel to drain evenly from all of the tanks in the current stage. To that end I made a Module Manager patch with the following text:

 

Quote

@PART[*]:HAS[@MODULE[ModuleEngines]:HAS[@PROPELLANT[*]]]:Final
{
@MODULE[ModuleEngines]
{
        @PROPELLANT[*]
        {
        @resourceFlowMode = STAGE_STACK_FLOW_BALANCE
}
}
}

@PART[*]:HAS[@MODULE[ModuleEnginesFX]:HAS[@PROPELLANT[*]]]:Final
{
@MODULE[ModuleEnginesFX]
{
    @PROPELLANT[*]
    {
    @resourceFlowMode = STAGE_STACK_FLOW_BALANCE
}
}
}

This should change the resource flow mode to the desired mode in all engines which use ModuleEngines or ModuleEnginesFX (every rocket and jet engine I've inspected the .cfg of), but it had no effect for me. I've only ever seen resourceFlowMode defined for jet engines (ModuleEnginesFX), and it's always defined as "STAGE_STACK_FLOW_BALANCE". Is this node simply not implemented for ModuleEngines, or have I made a silly mistake in my Module Manager syntax?

Thank you.