Salaah

Making sajdah-e-sahw after salaah

Q: Is it right to perform sajda-e-sahw if someone forgets to make it within salaah? When I remember, without reciting anything else, I just to sit down and recite attahiyyaat upto (abduhu warasuluh) then one salam on the right side then two sajdahs of sahw and then attahiyyaat, durood and dua and then 2 salaam. 

Walking in front of a musallee in a big jamaat khana

Q: I understand that if a person is in a Musjid-e-Kabeer, he may pass in front of a musallee, provided there is one saff or more between him and the musallee.

1. Does this rule also apply to a jamaat khana or a musalla that is equal in size to a Musjid-e-Kabeer or larger than it?

2. Does this rule apply in the sehn that is joined to the Musjid-e-Kabeer but is not regarded as part of the musjid?