We have plans to implement this at some point in the 1.3 branch. For now you have to manually emulate it by rendering the same path displaced by the desired amount. Yes, I know it is not the same (you can't emulate the blurring for example) but it quite efficient for text for example.

Could you tell me more about where do you need to apply this effect?

Yes it is for Text.

My game is a Movie Studio Tycoon type game.

In the game the users will make movies, and for each move a "Trailer" will be generated. There will be dynamically generated "Cut Scenes" overlayed with text (Movie Title & cast/crew names). Dropshadow is just one of the effects I would like to implement.

Here is an example:
http://i.giphy.com/l4HnSo5emSSUSQSVq.gifwpf

I see, so you need the blurring effect. I assume the hack used here

http://www.noesisengine.com/forums/viewtopic.php?f=12&t=485

won't work for you, right?

Yes, I would need the blurring effect.