Prayer

ANSWER: This is permissible, however you would lose half the reward if you did without a valid reason. 

ANSWER: You must cover this with an outer garment or at least wrap on yourself a bed sheet. 

ANSWER: This is permissible. 

ANSWER: The closer to the imam, the better, whether to the left or right. 

ANSWER: Those who said yes must not be asked about issues on Fiqh as the prophet salla allahu alaihi wa sallam had clearly said in an authentic hadeeth: there are no 2 witr on the same night! If you had prayed witr in the beginning of the night, you must pray 2×2 afterwards without repeating […]

ANSWER: Salatul tasbeeh is not permissible as it is an innovation. As for your 2 questions, No problem in both. 

ANSWER: Fitnah of mah’ya is all tribulations and temptations one faces in life such as wealth, women, power etc. Fitnah of death is while on his dying bed as some are prevented from saying the kalimah and are distracted by devils.  

ANSWER: You should keep moving it when you recite the entire tashahud until duas and put it down when you start to give salam. 

ANSWER: In this current situation, pray 4 rakahs of dhuhr at home and you can make a congregation for this with your family.