You are right currently it supports only limit order to enter, there are no Stop orders to enter. So if one wants to buy on breakout above 7515, then one has to wait till the breakout happens and enter a limit order. But I think they are working on it. Read Nithin’s response to Googol on the following z-Connect link
Having said that, Bracket Orders are useful in several ways
It is very useful for people who cannot actively track the market.
Trailing SL is only available with bracket order.
Additional leverage available / lesser margin requirement.