Easiest way to achieve the result is to make all the srf first. And cull the items that meets your criteria:
Despite, I would still want to know if David would thought about the option of introducing a trigger, that if False would turn off a component. Because that would result in less calculation and saves much time.

Perhaps the "enable component" option could be implemented like Galapagos, where an extra battery points to the components, and determine if the component is enabled or not.

I know this is an old thread, but is there anyway yet to enable / disable a component or cluster based on some type of value (e.g. true/false)?

I know that dispatch can be used to divert a stream, but what I often run into is a situation where several components have multiple outputs.  Basically, I want to pick and choose which component is active and produces the output streams.  If I do it with dispatch I have to put that dispatch onto every output stream which can get really messy.  What I think would work out much better is to have a Boolean enable channel on the components so I can just turn off the entire component / cluster.  That would provide an effective way of having mass dispatch.