. My question is about (ar-raum) when stopping on the ends of words which have a strong ending and have either a kasrah or a dhammah (but not a presented one) on the last vowel....much.

Question
Assalaamu alaikum and “Ramadan Kareem!”, May Allah reward you greatly for making the knowledge of reading the Noble Qur’an correctly available to so many people.
 My question is about ;  (ar-raum) when stopping on the ends of words which have a strong ending and have either a kasrah or a dhammah (but not a presented one) on the last vowel of the word as explained in your lessons. The question is: When does a student or a reciter use this way of stopping? Can someone chose to stop this way in their reading for the day instead of with a pure sukoon as long as they are consistent with doing that? or is there some other purpose for the raum stop? Thank you very much.

Answer
Wa alaikum assalaam wa rahamatullahi wa barakaatuh.
Jazakum Allahu khairan for your dua' and may Allah reward you with all khair in this world and the enxt.
The reciter uses , which is 1/3 of a nomal vowel length to show the vowel on the end of the word (when a dhammah or kasrah-not incidental is present).  The student or reciter can use this whenever they wish, but especially when words have vowelling which can be confused by a listener, or in which the vowel shows the complete meaning of Allah's words.  
For example the extra ya' at the end of some words dropped in writing as in:

Also is used to convey vowel in which the different qira'aat differ in, as in the dhammah on the last word in the phrase:

While most of the qira'aat read it with a dhammah, others have a fathah on the last letter of the above phrase.
These are only a few examples of ways to use it, but as we stated above, we can use it at anytime we would like in our reading.

For those unfamiliar with , please see the following link:
http://www.abouttajweed.com/stopping-on-the-ends-of-words/stopping-on-the-ends-of-words-1.html

You are most welcome