I think a light two handed spear should also be a finesse weapon. It can be about precision just as much as one handed piercing weapons.
Eh, this makes dex even more powerful than it already is so I'm hesitant. Plus it would unbalance the weapons. Currently:
-The best simple finesse weapon is a dagger, for 1d4 damage.
-The best martial finesse weapon is a rapier, for 1d8 damage, but it isn't light.
-The best martial light finesse weapons are the scimitar/shortsword, tied for 1d6 damage.
So a "simple finesse 2H spear" would be an incredibly overpowered simple finesse weapon.
And a "martial versatile and/or light finesse spear" would invalidate the scimitar and the shortsword.
A relatively balanced option is a martial spear, dealing 1d10 piercing damage with the "finesse" and "two-handed" properties. If it's big enough to be wielded in two hands, it probably shouldn't be "light."
If you want a finesse version of the pike, then 1d6 piercing with the "finesse", "two-handed", and "reach" properties (for comparison, the other "reach"+"finesse" weapon is the whip, dealing only 1d4 damage).
