Wireless Managager on Debian Wheezy

It appears Connman is being used to manage the network on Debian Wheezy.
Does this mean /etc/network/interfaces is no longer being used?
The only configuration file I have found for connman is /var/lib/connman/settings which has:

[WiFi]
Enable=false
Tethering=false
Can someone explain how to specify using /etc/wpa_supplicant.conf for storing passwords, and where to specify a static IP, gateway, DNS server,

etc? Does anyone have opinions re going back to NetworkManager?

sudo systemctl status -l connman.service
● connman.service - Connection service
Loaded: loaded (/lib/systemd/system/connman.service; enabled)
Active: active (running) since Wed 2015-12-16 20:42:22 UTC; 1min 35s ago
Main PID: 382 (connmand)
CGroup: /system.slice/connman.service
└─382 /usr/sbin/connmand -n

Dec 16 20:42:26 arm connmand[382]: usb0 {update} flags 4099
Dec 16 20:42:26 arm connmand[382]: usb0 {newlink} index 3 address D0:5F:B8:FC:51:E0 mtu 1500
Dec 16 20:42:26 arm connmand[382]: usb0 {newlink} index 3 operstate 2
Dec 16 20:42:26 arm connmand[382]: usb0 {add} route 192.168.7.0 gw 0.0.0.0 scope 253
Dec 16 20:42:26 arm connmand[382]: usb0 {del} address 192.168.7.2/24 label usb0
Dec 16 20:42:26 arm connmand[382]: usb0 {del} route 192.168.7.0 gw 0.0.0.0 scope 253
Dec 16 20:42:26 arm connmand[382]: usb0 {add} address 192.168.7.2/30 label usb0 family 2
Dec 16 20:42:26 arm connmand[382]: usb0 {add} route 192.168.7.0 gw 0.0.0.0 scope 253
Dec 16 20:42:26 arm connmand[382]: eth0 {add} route 82.165.8.211 gw 192.168.1.1 scope 0
Dec 16 20:42:26 arm connmand[382]: eth0 {del} route 82.165.8.211 gw 192.168.1.1 scope 0

You can always un-install connman and use "/etc/network/interfaces"

I just use it by default to remove the evil 2 minute delay that
login/getty will wait for eth0 when the cable isn't connected..

Regards,