Try:
<label for="features_1">
<input type="checkbox" id="features_1" name="features[0]" value="4"> foo
</label>
<label for="features_2">
<input type="checkbox" id="features_2" name="features[1]" value="8"> bar
</label>
EDIT
Or:
myForm.bind(myForm.bindFromRequest.data + ("features"-> request.body.asFormUrlEncoded.get("features[]"))).fold(
...
)
This will bind all other fields from request directly, and then when it comes to features, they are going to be added manually. If you don't need to bind more data then just write:
myForm.bind("features"-> request.body.asFormUrlEncoded.get("features[]")).fold(
...
)