Specifying fx activation in parts with multiple modules

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I've been hard at work creating an all-stock (welded) station parts pack, however I've been stumped by an fx issue with my Lav Module.

I welded together a bunch o' parts to make the module, including 4 micro engine nozzles for the venting of... ahem... excretions.

The fx definitions themselves aren't a problem, but I am unsure about how best to activate them. I decided to use engine modules with 0 thrust as the activators, but I don't know how to change the action group label in the VAB.

Of course the options show up as the usual, "activate engine, deactivate engine, toggle engine", however I would like them to say something to the effect of, "vent, close vent, toggle vent".

Is there a way to do this?

Also, while I'm at it, in parts with multiple modules, will "fxblahblahblah, activate" trigger the fx whenever any module is activated? Is there a way to more specifically define links between modules and fx?

Thanks lads.

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sorry, wrong forum... mods, can someone please move this to the development support forum? cheers.