Basically, have an option to auto "Highlight Usages in File" of whatever is under the cursor, but in grey or yellow (Eclipse 3.1 was yellow, I think - 3.2 changed it to grey), removing the highlights whenever the cursor changes. This wouldn't interfere with explicit requests for Highlight Usages in File. When Eclipse first added it, I didn't think it'd be that big a deal since that feature was a keystroke away (I think – or is there no option to explicitly highlight in Eclipse?) – but I've gotten hooked and really wish R# would do the same.