Prompt User for input - enter key approve

Hi team , 

i  using the " Prompt user for input " for getting the input from the operator .

The thing is I don't want the user have to press "OK" every time.

Even operator pressed " enter " key from keyboard  also should be accepted  . 

Note : I opened a front panel of Prompt user for input and looking to change .  What type property node should be used ? or some other alternative way to resolve this . 

suggest a methods 

Thanks in advance