Answer
(Fatwa: 1046/1046=M/1430)
It is sunnah to sit awhile between two sajdah, it will not render sajdah sahv wajib if missed. Sajdah sahv becomes necessary by leaving any wajib act. If more than one wajib are missed in salah, one sajdah sahv is sufficient.
(2) No, it is not allowed. If someone has to keep 60 fast of kaffarah and he has no excuse but is able to do so, he has to keep the fasts. But, if he is unable to keep the fasts, he can feed 60 poor persons:
وکفر ککفارۃ المظاھر ? أي مثلھا في الترتیب فیعتق أولاً، فإن لم یجد صام شھرین متتابعین، فإن لم یستطع أطعم ستین مسکیناً الخ (الشامي)
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband