Doctorin

Add doctorin to the SP buy list this could include things like
Combined assult:+1 to attacking units when land air and sea units are presend
Combined defence as above but for decence
allied strike: +1 attack when allied unit angadges same target
Allies defend: alows allied units adjacent to your capital to defend with your troops
Defend the shore: all boats while in seazone adjacent to city are attacked adding range
Bombard the shore: All boat attack land units for one round before landing on shore

these are ideas only but ment to get the ball rolling.