Yes, iTel S41 does support gesture controls.
Yes, iTel S41 does have the LED flash with the front camera.
Yes, you can use 2 different WhatsApp accounts in iTel S41. Not only that, you can use 2 different Facebook, Instagram and Twitter accounts as well.
Yes, iTel S41 does have the fingerprint sensor.
iTel S41 weight is just 155 Grams.