Two questions about GHC warnings

gistfile1.hs

-- 1) Is there way to get a warning if you aren't being explicit with your imports and exports?

-- OK:
module Foo (bar) where

import Foo (bar)
import qualified Foo as F

-- Warnings:
module Foo where
import Foo

---------------------------------------------------------------------------------------------

-- 2) Is there a way to loosen -fwarn-missing-signatures so it'd only warn if the function 
-- was exported from a module?

module Foo (bar) where

-- OK:
internalFunc = 1 +
bar :: Num a => [a] -> [a]
bar = map internalFunc

-- Warning:
bar = map (1+)