ACAS Bulletin Nr. 6 seems to indicate this response!
I found this on an ACAS Bulletin Nr. 6 published by John Law, Eurocontrol Mode S ACAS Manager of ACAS II in March 2005.
"Air traffic controllers base their actions on the comprehensive information shown on the radar display, which enables them to provide a safe and expeditious air traffic flow. The TCAS traffic display does not provide the information necessary forthe provision of separation and sequencing. Manoeuvres initiated solely on the information shown on the TCAS traffic display have often degraded flight safety. Therefore, pilots should not attempt to self-separate, nor to challenge an ATC instruction, based on the information derived solely from the TCAS traffic display. It is the controllers’ responsibility to separate aircraft."
So whether in a HOLD, SID, STAR of RV, The Controller knows what he expects you to do on horizontal scale which I assume means direction. The vertical scale is changed by the RA actions as directed by each aircraft's involved TCAS II?