If you do that, then you would end up just having a single recipe for "Stone" in the ME terminal. You have to put the specific item in the output slot as well for it to actually show up as a crafting job for that item.
And yeah, the crafting job will never technically be finished. But that is the whole point of making it a sub-network. It won't clog up your main network. You could just place down a Crafting Monitor and cancel them once in a while I guess. I don't bother personally
Don't do enough TC'ing for it to really become an issue.