Not sure if this has been asked for already. Im thinking an option in the vray displacement modifier would be good. Im doing carpets at the moment and to have this option for just the carpet plane would generate much better results.
Very much agree with this
Here is a the same wish asked long ago. Here’s what Vlado and other users suggested about this.
http://www.chaosgroup.com/forums/vbulletin/showthread.php?45765-Generate-GI-quickly