I think you are asking if isometric movement can contribute to muscle development. The awnser to that is yes, Some exercises like planking (abs) or wall sit(legs) are isometric exercies that can be very effective. Most of the time however there are simply better alternatives;
The short version is that you can train your muscles with: concentric, isometric and eccentric movements. There are examples of isometric exercises that can be very usefull, especially when you train everyday. You will not stimulate your muscle enough if you repeat the same exercies too often, so in this regard it could be a very nice adition to your routine.
For most cases however, controlled mechanical movements (concentric+eccentric) are the way to go. Putting stres on your muscles wil always imply the risk of injury and from this point of view isometric exercises are usually not worth it combined with the fact that it's very hard to stimulate certain musclegroups effectively using this aproach.
The front raise example that you describe is not advisable because it would put too much stress on your shoulderjoints and would most likely result in injury. It would be better to make slow controlled movements starting paralel from your body, and ending slightly above your head (or above it in case of FRTTR). While isometric training isn't very efective, it would be great to make sure you stop for a brief moment at the beginning and end of the exercise to make sure there is no momentum. The last, and perhaps the most important, part of the exercise is the eccentric phase, where you move the weight back to the starting poition. If you do this slowly and controlled you will gain allot more for you effort.
I hope this helps you distinguishing between the different trainingmethods.
Regards from Holland