I discussed your request with our development team and here's what we think so far. When in single selection mode, the ListPicker was designed with the philosophy that "there is always an active selection", so it makes sure to select an item when it initializes or when the list changes. This is how the native ListPicker behaves as well.
If we decide to implement the concept of EmptyContent (similar to Date- and TimePicker) this might potentially introduce breaking changes which, in turn, will make a lot of people unhappy.
The workaround you've implemented is the suggested way of achieving your particular scenario. This is the way Microsoft take when having ListPickers with "empty" selection in the Windows Phone OS.
I understand that introducing EmtpyContent will have certain benefits, but having in mind the above concerns, we should be very careful. We are going to further discuss the possibility of introducing a feature like that but for now our advice is to stick to the approach you have already implemented with a "dummy" item.
Let me know how urgent and necessary this feature is for you. I'd be glad to continue the discussion with you.
the Telerik team
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