we cannot include abilities like shield_wall and Schiltron in EB I because it is on the RTW engine and those are BI abilities. It is against EB policy to include material from a game the player may not have purchased and belongs to Sega.

On that note though, M2TW has the ability for us to include every formation, including phalanx, shield_wall, schiltron, square, wedge, cantabrian circle, testudo, line, etc. So in EB II your wishes will most likely be fulfilled.