OK. I works on my side now: you need to start IE in Elevated mode (run as Administrator). It works perfectly with both IE10 on Windows 7, and IE11 on Windows 8.1. Cheers!
I'm using iDRAC Enterprise 6 on Server 2012. When I connect to the virtual console using IE10 on Server 2012, no keyboard input is passed. I can send macros and mount virtual media, just no keyboard input is passed. Updated BIOS to 1.12.0 and iDRAC firmware to 1.95 (Build 05) and still not working. I am using the Native Plug-in Type and cannot use nor install Java nor any other browser on this server.  
iDRAC 6 Enterprise keyboard input with IE10 on Server 2012 not working