Since the 2051 doesn't cover UHF milair, the use of any software package is not likely to be very helpful to make it cover something for which it wasn't originally designed. If it will cover the 138-144 mhz band in AM mode, however, that's a possibility - there are a few Giant Killer and NORAD freqs in that range, and numerous Air National Guard planes can be found there during exercises.
The good news, however, is that there are many other scanners that will do a fine job on the UHF milair band - and don't need to be that expensive. I've seen several BC780s on the used market lists for around USD200 or so, there was a 785 on the used forum that got snatched up - heck, for UHF Milair, even the old and venerable BC895 will do the job (I use that scanner with RadioMax - works like a champ). You can get 895s dirt cheap.
73s Mike