Is there a work around for addEventListener callbacks with return value?

Question

Hi,

I'm currently experimenting with custom (level 2 DOM) events and I've now arrived at the problem that addEventListener() will not accept callbacks that return a value -- or at least I'm unfamiliar with the proper approach to this.

Basically what I want is this:

    addEventListener("customEvent",
        function() {
            return true ;
         },
    false) ;

so that if I create an instance of a wrapper function new wrapper(),

     function wrapper() {
         addEventListener(...) ;
     }

this will properly return, true whenever the event is triggered and caught.

Please keep in mind that this is experimental: I am aware that there are a plethora of solutions that do not require a return from an addEventListener method. I'm just curious whether there is a work-around or if this is in fact a dead-end and I should not bother.

Thanks for your help!