This is correct - RSD uses the WinPcap library to catch traffic, and this doesn't support wireless adapters. (Please see http://www.winpcap.org/misc/faq.htm#Q-16 for a good description.)
And yet a tool like Wireshark is able to capture "something" off the wireless. Even if those are "emulated frames" as discussed in the winpcap FAQ then I'd argue that'd be good enough to detect systems
That's entirely possible, but unfortunately this isn't a function that RSD offers in its current form. By all means submit a PER if this is a feature you'd like to see implemented.