I use My Vocabulary but the reason I would like to see smaller phrases included in the Extra Vocabulary is so that it will be individually tested in the testing section, e.g. "Hear It Say It!", "Write It!", and "Know It!". I also am using Rocket Spanish and they include more in their Extra Vocabulary.
My approach to learning a new section is to approach it in groups. Right now, for instance, I am working on Lesson 3.4 "Phone Call", Writing Lesson 3.12 "Sun, Moon and Stars", and Lesson 3.8 "Ways to Talk About". I do this because they are all related to one another. I will also execute numerous passes over this group to gain greater and greater mastery of the material.
The first thing I do is listen to the interactive audio and make notes via MyVocab of the things they say. Here I am paying close attention to the sub-phrases and the various nuances. The Rocket Review often highlights these. Then I proceed to the testing section where I drill and kill. First I drill on the "Hear It Say It". Then I do the "Write It". Then back to "Hear It Say It" and eventually to "Know It". I also often review earlier lessons this way.
Often times I spend a lot of time getting over the hump while tackling some of the longer sentences. Now, if there were a way for the software to add phrases I add to MyVocab to the testing, that would be good.
My suggestion is to do like Rocket Spanish does in its lessons in the Extra Vocabulary section and add the subphrases and words that the audio highlights. Once I drill and learn the simpler phrases, I mark them as easy while leaving the more difficult sentences "Needs Improvement". The software helpfully keeps drilling the "Needs Improvement" more often.