I am also facing the same problem.
MOODLE Version: 2013111801.01
MM App version: 1.4 (versioncode: 371)
In config.json, it only accepts "string" for "wsservice" attribute (default: moodle_moible_app). If I try to replace it with an array like
"wsservice" : ["moodle_mobile_app", "custommm"]
then I couldn't even get login. The error message is "Web service is not available (it doesn't exist or might be disabled)"
(My new custom web service is working fine with client.php but not in Mobile App. I have noticed that the token for each web service moodle_mobile_app and custommm is different and that's why it gives the error message "we lost connection, you need to reconnect. Your token is now invalid." then a white screen .)
Any help will be highly appreciated.