Guys, you might want to test this:
link removed Unzip to your #SAS, #DBW or mods (depending on your install) and add this line to your stationary.ini:
LandingFlare vehicles.stationary.MarkerFlare3$MarkerFlare3Unit 0
How it works:
Place on an airfield. Assign to any side, doesn't matter.
When you are within 2000m of the object, flying at altitude 1000m or below, and wiggle your wings to achieve a bank angle difference of -15 deg to +15deg or larger within 2 seconds, you will either get a green flare (=cleared to land), or if the runway is blocked or there is traffic on final, a red flare to /(&(%$ off.
Now, ATC might not recognize your wiggling the first time (this is because it takes a measurement every 2secs, and your rhythm could just happen to fall halfway into this = ATC sense no wing movement), so keep doing it until you trigger a reaction. I think this shortcoming actually adds to realism, might be that the tower guy was distracted flipping though his gentlemen magazines after all...
Once a flare was fired, another flare cannot be triggered until 30seconds have passed. Also, once your gears touch the ground, an even longer wait to the next possible flare is required.
This thing was only tested in once, so no guarantee it does what it's supposed to do.
Let me know about your findings please, once it works flawlessly I will repack a new one-stop-shop Relaistic Airfield Lighting mod containing all the new features.