A fitting replacement for the special attack of a spear would be some kind of penetration attack: Damage the target enemies and 1 enemiy in close range behind the target.
Medusa head scales with Int not Str, if my memory is not mistaken. Okey, it scales with Str, what seems a bit odd.
Why should more skills scale of Finesse? There are two finesse skill trees and one Str skill tree, so the really disadvantaged class would be every Str-build?
It is a general issue, that there are far more Int skills than from every other kind, because skill trees like Juggernaut got not picked from Kickstarters.