As a sidenote for this the US Army is currently trying to align warrant officer training directly with officer training, where WOs and officers attend officer leadership training together at various points, WO1/2LT, CW3/CPT, and maybe others. This is only in the works, though, and would only be for generic Army officer leadership courses.
Also, the Army is talking about constraining WOs to the ten-years-of-commissioned-service rule, as in a WO must serve ten years of commissioned service to retire as a warrant officer. This is the current rule for commissioned officers. Don't know when the push will come, but hopefully I'll be already be a warrant officer by then so I can get grandfathered in.