[LoloMo]

Problem is, it is impossible to formulate a house rule to define archer decoys.

If you have 1000 troops, a squad of 50 troops up front is an archer decoy. Or is it? So how many troops up front would make it NOT an archer decoy?

If you have 5 troops, 3 soldiers in front is not an archer decoy. Or is it? How many troops up front would make it an archer decoy?

If your rule is 3 soldiers up front make a decoy, what about 4? 5? 6? What about 2 squads of 3?, what about 6 squads of 2? What about 4 squads of 5?

So when is it an archer decoy, and when is it chaff? One can argue all tactics employing chaff are actually archer decoy tactics.

See, even with the above posted two extremes, you can get a debate going on which is an archer decoy and which is not. What about all the situations that are less extreme? Who wants to define all the possibilities and work out all the gray areas?

Therefore you can not make a house rule banning archer decoys, and I have yet to play in an MP game where it is banned.