The $39 (shareware) ClearView flight simulator that I use supports idle-up mode controlled by the function keys on the PC keyboard. It works perfectly "out of the box" with the Esky USB flight controller, supports photo-realistic flying fields (that you can create yourself with 360 degree digital camera images), and a ton of freely downloadable helicopter (and airplane) models! Buy it once, and you get all future upgrades for free. It lets you try flying for about 5 minutes before you buy. I've found it well worth it!

The ClearView web site is: http://rcflightsim.com/download.html which has links to other sites that contain free models and landscapes.