Yeah, you still have to do these to enable the superuser access, even for the application:
> adb shell mount -o remount,rw -t ext3 /dev/block/mmcblk0p25 /system
> adb shell /data/local/busybox cp /data/local/su /system/xbin/su
> adb shell chown 0:0 /system/xbin/su
> adb shell chmod 6755...