That is a very cool idea! And it raises more possibilities too. The Trow could be scripted to guard bacon balls, or to randomly move it somewhere else on the map periodically. Does it have to be a Trow? There could also be more than one unit, that do more than one thing...
Here's some ideas of mine... make some bre'Unor that lurk around the edges of maps and ambush campers, spiders that drop down on players randomly and attack, ghols that run around and toss satchels everywhere, cannons that periodically fire cannonballs at flags, wights or thrall that hide in water, Trow that stubbornly guard flags from all players, etc... The possibilities are almost endless.
Now if only I had the artistic skill to make a decent color map...
