Yes, you can use 2 4G sim cards in Comio C2. But at any given time only one sim card will work on 4G network.
Yes, you can use the 4G Jio sim card in Comio C2.
No. Comio C2 does not have the Gyroscope sensor.
No. Comio C2 does not have the fast charging support but you can use Sony CP-AD2 USB Charger to charge it faster. By using Sony CP-AD2 you can reduce the charging time by almost 35%.