Just played Plack a bit and get a crufty
app.psgi for Jifty apps. This can be placed in your Jifty app dir and run with
plackup --app app.psgi, but you'll have to modify the line that sets
JIFTY_APP_ROOT environment variable to your Jifty app path.
I hope this, and Jifty core, can be polished little bit so I don't have to localize ENV and STDOUT there.
Also, I tried this with mod_psgi, not working, always returning ABORT from dispatcher, very weird.