Ferris, I agree.
There should be;
1. Some way of ATC knowing that a/c are are on RA vertical Nav.
2. Regulations in place that mandate ATC response (or lack of) once they are aware of RA avoidance in progress, so that we can be (legally) absolved of Avoiding action requirements once RA avoidance takes over.
Sidenote: If I understand correctly, the advent of VDL Mode4 will greatly improve the automatic TX/RX if information between a/c and a/c as well as ATC and a/c.
SID