yea, i figured that out right away too. my test map was a mess last night of relays, and i pictured the wince at a whole if/then/else/not system, which would probably go too far.
but since I was waiting for a compile from rav last night, i put some examples in thedark. If I had time i'd just make the flagroom get darker and lightmaps pulse and warning lights go off (vertex users would never see it), as it was I just changed the blendfunc directional shaders to pulse when the flag is off the stand and alarms go off.
triggering different external lightmaps is da bomb, but there's always a fine line of 'what can be done' and 'how much friggin time do I have???!"