[web-devel] "yesod devel" and sandbox'ed environment

Hi, is it possible to have a sandbox'ed environment like cabal-dev together with this new "yesod devel"-environment? I've just thrown together a quick test with cabal-dev and a scaffolded yesod site, but calling "yesod devel" just gives me a bunch of missing dependencies. Any hints are highly appreciated. Thank you, Timo