Yeah IFF seems pretty straight forward but it won't hurt to know the details.
However I must say that I already knew the details of how IFF worked, namely how modes 1, 2, 3 and 4 works so looking at the IFF current modeled in BMS 4.34 is quite straightforward to me. Personally the only novelty was to learn that some IFF codes change at each hour but then again the DTC seems to manage this automatically.
I was always puzzled about why it took so long to implement IFF, namely the IFF that really matters for a Combat Flight Sim like Falcon BMS which is Mode 4.
Mode 4 is not only and by far the most useful IFF mode but at the same time it's also by far the easiest to comprehend.
Mode 1 and 2 are unencrypted modes and I would say somehow outdated modes (and as such not so useful, IMO) whose functionality is (IMO again) easily replaced by IDM/Data-link. Mode 3 is basically useful for the ATC only.
But yes, it's very interesting (and IMO very rewarding) to learn about these (and other) systems.
Thing is, I always had TMS left for radar azimuth and now I need to move that little bugger to another HOTAS, what are you guys using - HOTAS button or just click in MFD or a keystroke?
I need more buttons on my Warthog
Well, in the real F-16 the IFF interrogation is actually initiated by pressing TMS left which means that before BMS 4.34 (in 4.33 for example) this command didn't have any functionally because IFF was not implemented.
Personally regarding to radar, I usually scan in azimuth using full area. When I need to focus on a narrow area I usually keep TMS up pressed and I slew the TDC towards the area that I want to do a "focus" scan. But otherwise when I need to change the radar azimuth I click on the proper MFD button even because this is something that I usually don't change/mess with.