You know, I'm a little lost. Just how problematic is this? I don't mean this as an insult, but how many of us have actually written music where it was impossible, through the existing notational choices to have our hands tied putting down on paper pretty much what we intend? Is a straw man being built here to get a point across when there's really not much of a real problem. As I am following this thread, it seems to me that the only real problems that might exist are with performers having problems getting the interpretation down. And in that case, I would suggest that the problem originated with the composer not knowing how to get his point across.
Granted, there are times when something might be a bit ambiguous but in my experience, again, that's often the inability of the writer to use the tools that already exist. I'm just not seeing a problem to the degree that this thread might imply.