Well, in that case it should be mentioned that the romans also used a shield+spear tactic, or more accurately, several tactics.
First, the standard Roman Legionnaire carried not only one, but two (veterans even three) spears, a short one and a long one. However, the short one (pilum) was just for throwing. The long one could have been thrown or used as a one-handed spear. When the situation afforded it, they changed to short swords.
Just one of the reasions why it is said that the Roman Legionnaire was relatively the best infantryman of all times.
Roman Auxilary forces, however, used a long spear as their main weapon, thus not throwing it.
Well, in the end it could be noted, that - when it goes to military usage - spears are only effective in groups. That rule goes for almost any shaft-weapon, like halberds as well as pikes.
TBE ("The Black Eye", or in it's german original, "Das Schwarze Auge") has some rules in it's 4th edition for special bonuses, like "formation", which allows a minimum of three characters to help each other parrying enemy attacks. There's even a rule for two characters using the same one shaft weapon (only selectable when using a really long pike). The attack only works, when both characters succeed in their dice-throws - but then the weapon does double damage. This Feat can also be coupled with the "Storm Attack" maneuvre, etc...
Damn, just be careful that you don't put too many rules in your game. It is really hard to preserve one's overview with 4.th edition TBE, which has about two or three Feats/Maneuvres per weapon(!).
