Hi @onkar
Welcome to Dhan community and thank you for your kind words about Dhan, we are bringing more for all traders & investors.
On #1 For Trailing Stop Loss, you can add it to any trading position, for more details do check detailed post here: Introducing Trader’s Best Friend: Trailing Stop Loss on Dhan
On #2 Unfortunately we cant do much here, its app property. However user have done a hack here - turn off notifications in one app and turn in on in other. Works 
Thank you