I think "a value of feature maps to a dynamicField" is a nice to have function.
New patch attached. I changed DummyEntityAnnotator to express my idea and added test.
If no one objects, I'll commit in a few days.
Added a minor comment to the test Annotator.
trunk: Committed revision 1101047.
3x: Committed revision 1101049.
Bulk close for 3.2