Why Pray for Changing God's Plans?

Question: If God is the best Sustainer, why do you pray for changing His plans (whatever those may be)? 

Answer: 
1) From a human point of view: I suppose its a human need to reach out... its a natural instinct to pray, especially when one is out of options  

2) From the general Muslim point of view: God can do anything, so praying may change the situation. Indeed, collective prayers are held for water in periods of drought, etc. There is also the belief that prayers are never unanswered, so when someone prays to God, He never rejects any prayer: its either granted as is, or it is answered differently, or it is stored and carried forward for the Hereafter. You can read some more on it here: http://askaquestionto.us/question-answer/dua/does-allah-answer-prayer 

3) From my understanding of the Quran: whatever happens, both good and bad, is already destined and we should bear with patience whatever befalls us; though it is okay to pray for temporal things, what we should actually be praying for is guidance, so that we are able to believe and do good works: belief will qualify us for 'the Balance' on which will be weighed 'our deeds' [http://quran.com/18/105]; so that we are granted the 'Noor' for a safe passage [http://quran.com/57/12] around Hell and through the upheavals of the Day when the Heaven(s) and Earth are being destroyed and created anew, towards the Garden(s) of Eden which we qualify for [http://quran.com/8/4 , http://quran.com/3/133 , http://quran.com/57/21]. I think we can perhaps understand this in terms of the Theory of Balance, Theory of Chaos, Big Crunch and reversal of the Arrow of Time. Here is my understanding of Creation and relevant verses of the Quran: http://signsandscience.blogspot.com/2014/10/creation.html    

4) And when My servants question thee concerning Me, then surely I am nigh. I answer the prayer of the suppliant when he crieth unto Me. So let them hear My call and let them trust in Me, in order that they may be led aright. [http://quran.com/2/186]