Yes, each Taiji movement has many primary and secondary applications.
In the 24 form, as it was created for the purpose of popularizing tai chi by the communist government through standardized competitions, those applications are not shown during performance of the form.
And it is true, the applications are not popularly taught or practiced by many Tai Chi practitioners. But, that is fine, many people practice only for the benefits of moving meditation and qigong. That's great.
Lilman, it is not WRONG to add applications into your 24 form during your practice (add 100 of them!), but if you did it in a competition, there would be two extra moves that are not part of the official 24 form and you would lose points.
The 24 form is a modernized form. There is no secret 26 posture version taught only in TX.
If you want to train taijiquan in-depth, with martial apps, I recommend the 108 Yang form. More movements, more applications:
http://www.ymaa.com/publishing/tai-chi-dvd-book
And, returning to the topic of this thread, there are also many applications taught for Emei Baguazhang by Grandmaster Liang here:
http://www.ymaa.com/publishing/liang-shou-yu-dvd-books