Thanks to @fabiomassimo you can now define your Appfile for multiple platforms:
app_identifier "net.sunapps.1"
apple_id "felix@sunapps.net"
team_id "Q2CBPJ58CC"
for_platform :ios do
apple_id "fabio@sunapps.ios.net"
team_id 'Q2CBPJ58AA' # for all iOS related things
for_lane :enterprise do
app_identifier 'net.sunapps.ios.enterprise'
end
end