Well, you have to go for some compromise if you want a Like button painlessly. You may create html design in such a way user doesn't suspect that there are html elements.
Facebook needs its own sandbox which is basicly iframe containing Facebook code. This allows to "like" easy way (as facebook controls it). So, if you want to have a FaceBook like button in Flash - you can have it, but then it should call a function which resides in html javascript.
That's is kind of complicated and and involves 3 parties (flash, TW/html and Facebook/html), i.e. you won't be able to produce .exe and .swf. Because of this it is also a bit complicated to develop easy-to-use add-on.
So, i doubt that we will see it soon, but of course i can not speak for EP. Let's hope for the best :) Everything is possible ;)
Best wishes
My Tourweaver components:
http://www.optitecha.lt/categories/3