My question is about the fiqh of du'a: In the sunnah we read:
Anas b. Malik reported that the Messenger of Allah (ﷺ) prayed for rain pointing the back of his hands to the sky. (Sahih Muslim)
The Prophet (ﷺ) said: When you make requests to Allah, do so with the palms of your hands, and not backs, upwards. (Sunan abi Dawod)
When it was the day on which the Battle of Badr was fought, the Messenger of Allah (ﷺ) cast a glance at the infidels, and they were one thousand while his own Companions were three hundred and nineteen. The Prophet (ﷺ) turned (his face) towards the Qibla. Then he stretched his hands and began his supplication to his Lord ...
(From a long hadith which can be found in Sahih Muslim and elsewhere)
A man was supplicating with his two fingers so the Messenger of Allah (ﷺ) said: “Make it one, make it one.” (Jami' at-Tirmidhi)
Do these ahadith and others refer to different ways (manners/positions) of performing du'a?
Is it considered as sunnah to chose a certain manner for a certain (reason of) du'a?