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ICS' stock launcher, Apex, Nova and Trebuchet all support adding widgets by dragging them from the app drawer. However they can only do this if they are installed as a system app. One of them - I think Nova - also provides a helper app that can be installed in /system while the rest of the app remains a regular app.

Why can't normally installed launchers provide this feature?

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I don't think anyone except the developers of these launchers will be able to answer this. I would suggest contacting them directly with this feature request. – Chahk May 19 '12 at 16:08
This is not a feature request, this is a question why something is impossible. – Erik May 19 '12 at 23:19
I have clarified question title. If you don't like it, feel free to roll back. – Evil Angel May 20 '12 at 7:59

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