DxDesigner "IBIS" property works for all of that in EE2007. In EXP2005 DxDesigner "IBIS" attribute works for CES model assignment and consequently for ICX Pro Explorer, but not for HyperLynx BoardSim and not for ICX Classic. So for those two a simple script to create appropriate .ref or . scm files would do the trick.
Actually, it would be great if user could decide which property to use for IBIS model assignment.