generating other files through hpack/stack

I'd like to be able to use tools like hlint and stylish-haskell easily with stack. Unfortunately, as we use a lot of GHC extensions and pragmas, this means that I end up manually updating their config files. Given that stack is already generating *.cabal files, might it be possible to have other files (.ghci-extensions or whatever) generated at stack build time? is the hpack mechanism externally extensible?

apologies if this is a naive question - if there's an easier way to make this smooth i'd appreciate it.