Lunge - Effort +2?, double the Reach of your weapon for that attack (might not just be spear-specific?) Or could do a 50% increase a second tier to choke down lower than a spear is normally held to double?
Same as Whirling Blade (sword) but with a spear?
Trip Attack - Intercept attack vs attempted movement, targets legs, if movement is intercepted the target also ends up prone
Pin Attack - Attempt to pin a prone opponent to the ground. Must be vs an unarmored or lightly armored body part? Damage reduced or at DIS? Might just inhibit movement, prevent from standing? Basically, starts a ranged Grapple if successful and I imagine the attacker using this would be making Grapple checks at DIS to maintain
Brace vs Charge - Ready your spear vs an incoming charge, intercept upon contact, if successful deals damage at ADV
Combo (2 handed polearms) - attack with alternating ends to gain ADV on the 2nd attack despite being a single armament