[Meorawr]

Example code, this'll set the scale of spec buttons 2-<whatever the limit is> to be twice as large.

local f = CreateFrame("Frame");
f:RegisterEvent("ADDON_LOADED");
f:SetScript("OnEvent", function(self, event, arg1)
      -- These are not the addons you're looking for.
      if(event ~= "ADDON_LOADED"
      or arg1 ~= "Blizzard_TalentUI") then
         return;
      end
      -- Hook function.
      hooksecurefunc("PlayerTalentFrame_CreateSpecSpellButton", function(frame, index)
            -- Determine the name of the created frame.
            local scrollChild = frame.spellsScroll.child;
            local name = scrollChild:GetName() .. "Ability" .. index;
            local button = _G[name];
            -- And now do what you need with the button!
            print(button);
            button:SetScale(2.0);
      end);
      -- In addition, note that SpellSpecButton1 SHOULD exist when the hook is already in place. So you'll need to do stuff to it now as well.
end);

Edit: Oh, you figured it out. Damn it