I bought this app and gave it a try since it is the only one I found with REAL background data management capabilities. So, this is a great beginning, although the app is not completely useful to me. I was looking for an automatic background data toggle following WiFi status, I mean, turn on bg data when WiFi is on and turn it off at WiFi shutdown. I know this is just a manual toggle, but I was wondering if I can use the toggle along with any profiler (like Tasker, Setting Profiles, etc). This way, I could set up a rule that triggers on WiFi On/Off and changes bg data status using your widget. Unfortunately, this cannot be done as there is no 'activity' to be associated to under Multi Toggle activities node. So, my suggestion is that you expose any public activity to toggle bg data, so it can be used when setting up rules from any profiler. Of course you can also develop an app to auto turn on/off bg data on wifi on/off...
... a lot of people is waiting for that since bg data has sense when wifi is on in most of the cases. Otherwise, it will drain battery.
Another suggestion, please make an easy way to uninstall when installed as system app (restore to user app or something... just to avoid a manual removal from /system/app).